Texas, USA 2010 - International Herbage Seed Group

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Talamucci P. (1998) Il ruolo della Sulla nell‟attuale contesto della foraggicoltura italiana. IGeorgofili, Quaderni 1998-I, Firenze, 7−27.Watson, M.J. (1982). Hedysarum coronarium, a legume with potential for soil conservation andforage. New Zealand Journal of Agricultural Science 16:189−193.151
<strong>Seed</strong> yield components and yield per plant in populations of Panicumcoloratum L. var. makarikariensis GoossensBarrios, C. 1 , L. Armando 1,2 , , G. Berone 1,3 & A. Tomás 1 . 1 INTA EEA Rafaela, Ruta 34 km 227 (2300).Rafaela, Santa Fe, Argentina. 2 CONICET. 3 Lehrstuhl für Grünlandlehre, Technische UniversitätMünchen, Am Hochanger 1 D-85350 Freising-Weihenstephan, Germany.E-mail: matomas@rafaela.inta.gov.arAbstractPanicum coloratum L. var. makarikariensis Goossens (makarikari grass) is a warm-seasonperennial bunchgrass native to South Africa, adapted to subtropical, subhumid environmentswith heavy soils, that tolerates seasonal flooding and relatively long periods of drought. Theobjective of this study was to evaluate the extent and nature of variation in seed yieldcomponents in a germplasm collection with a limited genetic base. Research material included 5populations coming from a wide range of soils and different management regimes in northcentralArgentina. Number of seeds per panicle was determined using a seed trap in each of 10individual plants per population. Mature and empty seeds were determined. Number of paniclesper plant was counted at the end of the harvest period. Weight of 1000 mature seeds wasestimated by averaging the weight of 3 samples of 100 seeds. Number of mature seeds per plantand yield (g) of seeds per plant were obtained by multiplication of the factors involved. Data wasanalyzed using ANOVA and population means were compared by LSD at the 0.05 level ofsignificance. Correlations and path coefficient analysis were performed on the seed data.Populations differed markedly in seed yield per plant and the number of mature seeds perpanicle. Minor differences were detected in seed weight and no difference was evident in numberof panicles per plant. Therefore, the component most associated to yield per plant was thenumber of mature seeds per panicle. Further studies need to be performed to evaluate geneticvariation and heritability of this trait to be included in a breeding program.IntroductionPanicum coloratum L. is a warm-season cross-pollinated perennial bunchgrass native to SouthAfrica that has been used around the world to improve pastures and in range revegetation (Lloyd1981), given its wide adaptability and its ability to tolerate seasonal flooding in addition to longperiods of drought (Tischler & Ocumpaugh 2004). It present there are two varieties: var.coloratum (kleingrass), extensively grown in <strong>Texas</strong>, was developed primarily for utilization asgamebirds, and var. makarikariensis Goossens (makarikari grass), utilized in Queensland,Australia, on heavy clay soils subjected to heavy grazing (Lloyd 1981; Tischler & Ocumpaugh2004). In Argentina, P. coloratum has been introduced as a forage grass several times (Petruzziet al. 2003) from different sources but its use has not been used extensively in the country. Toincrease the sowed area, production of good quality seed is crucial and therefore, a breedingprogram has been recently initiated at the National Institute of Agricultural Technology (INTA)152
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Proceedings of the 7th Internationa
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Table of ContentsORAL PRESENTATIONS
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Seed yield components and yield per
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International Herbage Seed Conferen
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16:15 - 16:30 Reliability of salini
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Hotel expense is covered for night
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40,000 were slaves (McDonald, 2007)
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Fig. 1. Texas AgriLife Research and
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$7 billion for cattle, $3 billion f
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principle and encourages both AgriL
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eceived by growers, the above perce
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seed conditioning plants are locate
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Table 4.Hectares of open-field burn
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system, a seed crop is produced fro
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Fig. 1. Land resource areas of Texa
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y land owners. Seed yields are low
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The influence of planting density o
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Simple correlation and regression a
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Variation in seed shattering in a g
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Seed retention (SR) was calculated
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mm160120Precipitation8040020Km h -1
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Young, B. A. (1986). A Source of Re
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Several methods are commonly used f
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Table 3. Effect of the length of ha
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Alfalfa seed production in semi-hum
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Rather near the meteorological stat
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ReferencesBolaños-Aguilar E.D., Hu
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ased bioenergy conversion plants wa
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Table 1. Average distances required
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Figure 1. Optimized locations for 1
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Perennial ryegrass (Lolium perenne
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Relative Seed Yieldsingle composite
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Flowers, M.D.; Hart, J.M.; Young II
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Thus, similar to tissue tests, remo
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Conclusion:Perhaps our most importa
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Modelling critical NDVI curves in p
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The five spectral reflectance measu
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Harvest loss in ryegrass seed crops
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Larger than expected harvest losses
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Rolston, P.; Trethewey, J.; McCloy,
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Optical sensors have the potential
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Figure 2. Seed yield response to ap
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Flowers, M. D., Hart, J.M., Young I
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In 2010, France has launched the fo
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Yield (% maximum)ConclusionThe resu
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Plant N uptakeN unavailableSoil nit
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Stresses associated with germinatio
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correspond to electrical conductivi
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applied later in the fall was more
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Figure 2. Establishment of five ove
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The seed vigour testing was perform
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Table 1. Germination index (GI) for
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Reliability of salinity screening L
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AcknowledgmentThis research was sup
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Table 2. Greenhouse salinity screen
Page 111 and 112: The seeds were collected from the A
Page 113 and 114: increases germination to its potent
Page 115 and 116: Light, lodging and flag leaves-what
Page 117 and 118: Relative seed yieldSeed yield (kg/h
Page 119 and 120: Hampton, J.G.; Clemence, T.G.A.; He
Page 121 and 122: The seed set is of major importance
Page 123 and 124: In grass species with poor seed ret
Page 125 and 126: support system to optimize fungicid
Page 127 and 128: weather stations in grass seed fiel
Page 129 and 130: ust resistance loci in Lolium peren
Page 131 and 132: Seed yield variation in a red clove
Page 133 and 134: 100Seed yield plant -1 (g)806040200
Page 135 and 136: Marden, J. H. 1984. Remote percepti
Page 137 and 138: Crimson clover seed production in t
Page 139 and 140: Piper, C.V. 1935. Forage plants and
Page 141 and 142: deal of investigation into the caus
Page 143 and 144: genes and subsequent ability to pro
Page 145 and 146: Gatenby, W.A., S.C. Munday-Finch, A
Page 147 and 148: Control of Vulpia myuros in red fes
Page 149 and 150: The strip design provides an opport
Page 151 and 152: The pot experiments did not reveale
Page 153 and 154: CharacterWeed abundance1 A few plan
Page 155 and 156: Jensen, P. K. (2010) Longevity of s
Page 157 and 158: Effects of intraspecific competitio
Page 159 and 160: flowering, Gangi accumulated a high
Page 161: The seed yield of Gangi was, on ave
Page 165 and 166: ResultsVariation among populations
Page 167 and 168: Table 2. Means of total seeds per p
Page 169 and 170: Ryle, G. J. (1970). Partition of As
Page 171 and 172: Control of Apion trifolii in red cl
Page 173 and 174: Number of seeds /inflorescencesimil
Page 175 and 176: population. However, in spite of th
Page 177 and 178: Corvallis where they were debearded
Page 179 and 180: Table 1. Effect of Palisade growth
Page 181 and 182: Variations on potential and harvest
Page 183 and 184: Determination of optimum desiccatio
Page 185 and 186: Relative seed yield (%)Flowers/m225
Page 187 and 188: Harvesting too soon after peak flow
Page 189 and 190: Annual ryegrass seed production in
Page 191 and 192: seed yield, kg/haExtractable Al, mg
Page 193 and 194: ReferencesHaby, V.A. (1995). Soil m
Page 195 and 196: Kentucky bluegrass (Poa pratensis L
Page 197 and 198: urn residue management (Fig. 1 and
Page 199 and 200: Comparing herbicide selectivity in
Page 201 and 202: Development of new tetraploid Chlor
Page 203 and 204: Following 4 (or 5) cycles of select
Page 205 and 206: Loch, D.S., Rethman, N.F.G. & van N
Page 207 and 208: KBGcocksfootHykorLofatimothymeadowf
Page 209 and 210: Figure 2 Relative seed yield (%) se
Page 211 and 212: and GA 4 . In consequence this inac
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Table 1 The effect of trinexapac-et
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Silberstein, T.B., Young, W.C. III,
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inflorescece number and seed yield
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Germination of Lolium multiflorum g
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Effect of sowing density on seed yi
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y-products of this grass seed crop
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Table 2. Effect of PGR on seed yiel
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Further culm length measurements ga
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chlorophyllometer. Measurements wer
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Table 2. Photosynthesis rate of fla
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Organization of grass seed research
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Path Coefficient and Ridge Regressi
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through y4 (0.133). Increasing y 1
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Newell G.J., Lee B. (1981)Ridge reg
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Relative humidity, seed moisture co
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Ergovaline contents in grasses from
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11.8 % (Central East) to 40.0% (Nor
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ReferencesBony, S. & Delatour, P. (
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Long-term Evaluation of Annual Ryeg
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seed yield. All systems of establis
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Preliminary results after four year
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Casals, Marie-LaureFNAMSImpasse du
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Mao, PeishengForage Seed LabChina A
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Vanasche, DavidVanasche Farm36130 N
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