UNIVERSITE DE BOURGOGNE THÈSE Yongbo LIU - Université de ...

Field experiment
Number of siliques and seeds per plant, weight of seeds per plant, reproduction allocation and
number of germinated progeny were higher in wild radish from the DM region than that from
the other three regions, BT, BG and NM, where these traits were not significantly different
each other (Fig. 4.7). Plants from BT had the highest weight, NM the lowest, and BG and DM
were i ntermediate. BT a nd D M ha d t he greatest pe r s eed w eight, a nd B G pr oduced t he
smallest seeds. The germination of the BT and DM seeds was the highest, and that from BG
was the lowest (Fig. 4.7).
The first principal component of PCA explained 74 % of the variance and consisted of
contribution by plant weight ( r=0.26), num ber of s iliques pe r pl ant ( r=0.94), num ber a nd
weight of seeds per plant (r= 0.96 and r=0.96), and number of germinated seeds (r=0.96). The
performance of D M pl ants a long t his a xe 1 w as s ignificantly higher t han t hat o f t he ot her
three regions where there was no difference (Fig. 4.8).
Wild radish in BT, BG, DM and NM produced on average 16, 66, 114 a nd 42 seeds per
plant, respectively. All the 1134 a nd 1526 s eedlings germinated from the seeds of NM and
BT+BG+DM, r espectively, w ere ki lled b y t he herbicide, i ndicating t hat no i nterspecific
hybrid was produced. BT showed 55% yellow and intense yellow petal, BG 95% yellow, DM
80% i ntense yellow a nd N M 65% yellow. T here w ere no di fferences i n s eed pr oduction
among plants with different petal colors within the regions (P>0.05), with except for NM. For
NM, plants with different petal color produced different seed number (F2,34=3.58, P=0.039),
and plants with yellow petal produced more seeds than plants with white petal (TukeyHSD’s
test, P=0.041): 12 seeds per plant for yellow vs. 4 for white petals, on average.
Cage experiment
The emergence rate of BT seedlings was the same as that of DM, which was higher than that
of BG and NM. Wild radish from BT flowered latest compared with the other regions, and
DM f lowered t he earliest. T he r eproduction a llocation of w ild r adish w as n ot s ignificantly
different among regions (Fig. 4.9). Plant weight, biomass, number and weight of articles per
plant, a nd pe r a rticle w eight w ere l owest f or t he B G region t han t hat f rom t he ot her t hree
regions, BT, DM and NM. Wild radish from BT produced higher biomass, weight of articles
per pl ant, a nd pe r article w eight t han DM a nd NM di d; t he t hree r egions pr oduced s imilar
plant weight and number of articles per plant (Fig. 4.9).
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