Hayes and Garber - Cucurbit Breeding

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232 BREEDING CROP PLANTS variety can be rejuvenated by planting under a favorable environment tubers from diseased plants is as yet an unanswered question. The rapid deterioration of varieties when University Farm tubers are used for theii propagation is believed to result from these transmissible diseases which are now called "mosaic dwarf." Degeneracy can apparently be prevented by covering that part of the field in which tubers are to be saved for the next year's planting by a cheese-cloth cover. The following data with the variety Green Mountain seem sufficient authority for this statement: TABLE LVIII. DEGENERACY PREVENTED BY USING TUBERS OF VINES WHICH WERE COVERED WITH A CHEESE CLOTH COVER Source of timber used
practical POTATO IMPROVEMENT 233 breeder to discard "clonal selection" as one means of obtaining high yields, for it is a recognized fact that seed plot methods are of much practical importance. The results, however, are probably not due to the isolation of bud mutations but rather to the use of tubers which have developed normally and which furnish the right conditions to give the resultant plants a favorable start. May not the conditions be much the same as with any vegetatively propagated plant. Bonnier, for example, found that about three years are required before a low- FIG. 58. Tubers produced under such a cheesecloth cover have given good yields during the seasons 1918 and 1919 while tubers from uncovered vines produced very inferior yields. University Farm, St. Paul, Minnesota. (Courtesy of Krantz.) land dandelion transported to alpine conditions fully expresses the characters of a dandelion plant which had been grown under these conditions for many years. On returning the same plant to the lowlands about the same number of years elapsed before the plant had again fully attained the lowland habit. This is probably not a germinal change but the normal expression of the plant under a particular environment. With the clonally propagated potato there is a cumulative response to unfavorable conditions. Such conditions modify the plant's development and therefore influence the development of the following year's crop. There seems no reason for believing that an actual germinal mutation has occurred.
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AGRICULTURAL AND BIOLOGICAL PUBLICA
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s'g S 2 ! o s s
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COPYRIGHT, 1921, BY THE McGRAW-HiLL
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PREFACE Since the early development
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. Early CONTENTS CHAPTER I INTRODUC
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CONTENTS xiii PAGE Color of grain a
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CONTENTS XV PAGE Sorghum 178 Origin
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CONTENTS xvn CHAPTER XIX FARMERS' M
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2 BREEDING CROP PLANTS times by pri
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4 BREEDING CROP PLANTS "In the vege
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6 BREEDING CROP PLANTS more attenti
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8 BREEDL\C CROP PLANTS by one of it
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10 BREEDING CROP PLANTS 1. Variabil
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12 BREEDING CROP PLANTS bud sports
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14 BREEDING CROP PLANTS who gives t
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* CHAPTER II PLANT GENETICS 1 Since
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18 BREEDING CROP PLANTS pair being
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20 BREEDING CROP PLANTS The Inherit
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22 BREEDING CROP PLANTS which are n
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24 BREEDING CROP PLANTS There is a
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26 BREEDING CROP PLANTS and Pr. let
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! 28 BREEDING CROP PLANTS The gener
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30 BREEDING CROP PLANTS intermediat
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32 BREEDING CROP PLANTS a conceptio
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34 BREEDING CROP PLANT* Group 4. Ve
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36 BREEDING CROP PLANTS crosses. Sm
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38 BREEDING CROP PLANTS mas protrud
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40 BREEDING CROP PLANTS between the
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Average 42 BREEDING CROP PLANTS tob
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44 BREEDING CROP PLANTS same for th
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46 BREEDING CROP PLANTS order to il
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48 BREEDING CROP PLANTS existence i
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50 BREEDING CROP PLANTS basis of do
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52 BREEDING CROP PLANTS certain con
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54 BREEDING CROP PLANTS for the pur
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56 BREEDING CROP PLANTS four plots.
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58 BREEDING CROP PLANTS TABLE XI. T
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60 BREEDING CROP PLANTS series then
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62 BREEDING CROP PLANTS central row
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64 BREEDING CROP PLANTS nating rows
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66 BREEDING CROP PLANTS The groupin
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68 BREEDING CROP PLANTS Two men may
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70 BREEDING CROP PLANTS A common pr
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72 BREEDING CROP PLANTS method (1),
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74 BREEDING CROP PLANTS flowers whi
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76 BREEDING CROP PLANTS Classificat
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78 BREEDING CROP PLANTS crosses bet
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80 BREEDING CROP PLANTS and those f
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82 BREEDING CROP PLANTS generation
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84 BREEDING CROP PLANTS nuclei, the
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86 BREEDING CROP PLANTS crosses bet
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88 BREEDING CROP PLANTS The Howards
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90 BREEDING CROP PLANTS CC. Lemma w
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92 BREEDING CROP PLANTS development
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94 BREEDING CROP PLANTS grains on h
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96 BREEDING CROP PLANTS susceptibil
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98 BREEDING CROP PLANTS gous forms
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100 BREEDING CROP PLANTS was though
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102 BREEDING CROP PLANTS mediates b
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104 BREEDING CROP PLANTS crosses ha
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106 BREEDING CROP PLANTS Wild rye,
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108 BREEDING CROP PLANTS same plant
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110 BREEDING CROP PLANTS Time of cu
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112 KREEDINd CHOP PLANTS variety te
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114 BREEDING CROP PLANTS Selection.
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116 BREEDING CROP PLANTS of selecti
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CHAPTER IX SOME RESULTS OF SELECTIO
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120 BREEDING CROP PLANTS Briefly, i
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122 BREEDING CROP PLANTS In the abo
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124 BREEDING CROP PLANTS correlatio
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126 BREEDING CROP PLANTS likewise s
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128 BREEDING CROP PLANTS WHEAT SELE
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130 BREEDING CROP PLANTS TABLE XXVI
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CHAPTER X SOME RESULTS OF CROSSING
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134 BREEDING CROP PLANTS A Wheat Cr
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136 BREEDING CROP PLANTS Among othe
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138 BREEDING CROP PLANTS some of th
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140 BREEDING CROP PLANTS to quality
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142 BREEDING CROP PLANTS index is o
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144 BREEDING CROP PLANTS Factor sys
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146 BREEDING CROP PLANTS Later more
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148 BREEDING CROP PLANTS Parents Co
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150 BREEDING CROP PLANTS The Lyon b
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152 BREEDING CROP PLANTS isolated t
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154 BREEDING CROP PLANTS 4 FIG, 34.
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156 BREEDING CROP PLANTS same resul
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158 BREEDING CROP PLANTS grown for
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160 BREEDING CROP PLANTS longer tha
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162 BREEDING CROP PLANTS with the p
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164 BREEDING CROP PLANTS "4. When a
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166 BREEDING CROP PLANTS variabilit
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168 BREEDING CROP PLANTS 1910 to 19
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170 BREEDING CROP PLANTS
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172 BREEDING CROP PLANTS normal var
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174 BREEDING CROP PLANTS branching
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176 BREEDING CROP PLANTS hybrid seg
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178 BREEDING CROP PLANT* which are
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180 BREEDING CROP PLANTS the settin
Page 206 and 207: 182 BREEDING CROP PLANTS organs. Th
Page 208 and 209: 184 BREEDING CROP PLANTS Xenia may
Page 210 and 211: 186 BREEDING CROP PLANTS manner as
Page 212 and 213: 188 BREEDING CROP PLANTS to a singl
Page 214 and 215: 190 BREEDING CROP PLANTS pure race
Page 216 and 217: 192 BREEDING CROP PLANTS Studies of
Page 218 and 219: 194 BREEDING CROP PLANTS B. RESULT
Page 220 and 221: 196 BREEDING CROP PLANTS corn and g
Page 222 and 223: 198 BREEDING CROP PLANTS TABLE XLV.
Page 224 and 225: 200 BREEDING CROP PLANTS system of
Page 226 and 227: 202 BREEDING CROP PLANTS Kempton we
Page 228 and 229: 204 BREEDING CROP PLANTS general ru
Page 230 and 231: 206 BREEDING CHOP PLANTS abnormalit
Page 232 and 233: 208 BREEDING CROP PLANTS sis), Cana
Page 234 and 235: 210 BREEDING CROP PLANTS plant sele
Page 236 and 237: 212 BREEDING CROP PLANTS The practi
Page 238 and 239: 214 BREEDING CROP PLANTS TABLE LIII
Page 240 and 241: 216 BREEDING CROP PLANTS belong to
Page 242 and 243: 218 BREEDING CROP PLANTS correlatio
Page 244 and 245: 220 BREEDING CROP PLANTS approached
Page 246 and 247: 222 BREEDING CROP PLANTS P. Segrega
Page 248 and 249: 224 BREEDING CROP PLANTS 1. The het
Page 250 and 251: 226 BREEDING CROP PLANTS TABLE LV.
Page 252 and 253: 228 BREEDING CROP PLANTS These earl
Page 254 and 255: 230 BREEDING CROP PLANTS For the 16
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Page 260 and 261: 236 BREEDING CROP PLANTS not known,
Page 262 and 263: 238 BREEDING CROP PLANTS Le = long
Page 264 and 265: 240 BREEDING CROP PLANTS TABLE LXI.
Page 266 and 267: 242 BREEDING CROP PLANTS shell bean
Page 268 and 269: 244 BREEDING CROP PLANTS data on th
Page 270 and 271: 246 BREEDING CROP PLANTS TABLE LXII
Page 272 and 273: 248 BREEDING CROP PLANTS need not b
Page 274 and 275: 250 BREEDING CROP PLANTS radish pla
Page 276 and 277: 252 BREEDING CROP PLANTS kohl-rabi.
Page 278 and 279: 254 BREEDING CROP PLANTS TABLE LXV.
Page 280 and 281: 256 BREEDING CROP PLANTS nucleus of
Page 282 and 283: 258 BREEDING CROP PLANTS These data
Page 284 and 285: 260 BREEDING CROP PLANTS recommende
Page 286 and 287: 262 BREEDING CROP PLANTS varieties
Page 288 and 289: 264 BREEDING CROP PLANTS TABLE LXVI
Page 290 and 291: 266 BREEDING CROP PLANTS probably a
Page 292 and 293: 268 BREEDING CROP PLANTS condition
Page 294 and 295: 270 BREEDING CROP PLANTS very notic
Page 296 and 297: 272 BREEDING CROP PLANTS these vari
Page 298 and 299: 274 BREEDING CROP PLANTS bud sports
Page 300 and 301: The 276 BREEDING CROP PLANTS Stewar
Page 302 and 303: 278 BREEDING CROP PLANTS made and 4
Page 304 and 305: 280 BREEDING CROP PLANTS 1. A knowl
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282 BREEDING CROP PLANTS WHAT IS GO
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284 BREEDING CROP PLANTS METHODS OF
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286 BREEDING CROP PLANTS The seed p
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288 BREEDING CROP PLANTS report of
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290 BREEDING CROP PLANTS 5. Give sp
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292 BREEDING CROP PLANTS First Year
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DEFINITIONS 1 Acquired Character. A
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296 BREEDING CROP PLANTS Heredity.
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298 BREEDING CROP PLANTS Replicatio
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300 BREEDING CROP PLANTS BALLS, W.
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302 BREEDING CROP PLANTS CUMMINGS,
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304 BREEDING CROP PLANTS FRANDSEN,
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306 BREEDING CROP PLANTS HARRIS, J.
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308 BREEDING CROP PLANTS 1912. On t
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310 BREEDING CROP PLANTS LEAKE H. M
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312 BREEDING CROP PLANTS NILSSON-EH
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314 BREEDING CROP PLANTS RUSSELL, H
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316 BREEDING CROP PLANTS 1915. Die
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318 BREEDING CROP. PLANTS 1918. Inh
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320 INDEX Breeding, cotton, 177 cuc
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322 INDEX ( iaincs, disease resista
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324 INDEX Le Couteur, selection, sm
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326 INDEX Ray, species, first use o
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328 INDEX Wheat, artificial crossin
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Hayes and Garber - Cucurbit Breeding

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