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., 1984 ). We accordingly hypothesized that the peak bloom of F flowers in ‘73-S-20’, with synchrony and crossing with the M 2 flowers of ‘Haak Yip’, is one of the causes of erratic fruit set and the shriveled seed ratio of ‘73-S-20’ ( Chang, 2004

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Optimum temperature for azalea seed production from a fertile cross was 70°F. Plants grown at 80°F yielded fewer seeds because of a reduction in the number of seeds per fruit Plants grown at 62°F or below yielded fewer seeds because of a decrease in the number of fruits set.

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. Supporting this association between seed number and fruit size and development period are cases where interspecific crosses have been compared with crosses that were either self- or cross-pollinated. Aalders and Hall (1961) found reduced seed set in lowbush

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to ascertain whether HT during flowering affects floral bud development duration, flower opening behavior, fruit set, fruit weight, seed setting, which was expressed as the estimated number of seeds, and seed weight per fruit, and cladode

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Plants of Phaseolus vulgaris ‘Red Kidney’ were studied under controlled environmental conditions to determine the effect of prefertilization events on seed and pod set. These were analyzed on flowers of the terminal receme at anthesis and 7 days postanthesis. Microscopic examination of pollen indicted that less than 7 % of the grains were aborted and that a sufficient number of grains germinated on the stigma to ensure fertilization of all ovules within an ovary. All ovules observed were fertilized; the number of ovules per ovary was 4 or 5. Results indicate that the discrepancy between the number of ovules and the final seed number per pod is due to seed abortion rather than to ovule abortion. Pod abortion appears to be a consequence of postfertilization processes.

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Abstract

The pansy, Viola tricolor Hortensis, L. is a popular bedding plant, however, the problem of low seed set has hindered genetic studies, plant breeding efforts, and the production of Fl hybrids. Twenty-nine commercial inbred pansy lines were investigated cytologically to establish a possible relationship between chromosome number and pollen fertility. The somatic chromosome number of all lines studied was found to be 2n=48 and pollen fertility was above 90 percent. Preliminary hybridization investigations suggest the problem may be an incompatibility system.

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Abstract

Genotypes and pollination dates, but not cuttings, contributed significantly to variance in percent pseudo-self-compatibility (PSC) from self pollinations of F2 sibling Nemesia strumosa Benth. plants. Genotypes selected from different families which were self- and cross-pollinated on several dates in 4 locations having varying environmental conditions responded differently to environments. Correlations between seed set and daily temperatures were significant in only a few cases. Tests of the effect of plant age on seed set revealed that plants generally set fewer seeds following either self- or compatible-pollinations when old, but the ratio of self- to compatible-cross seed sets (percent PSC) varied with genotype.

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A complete 4 × 4 diallel showed significant self-incompatibility and reciprocal differences in L. × ‘Mid-Century’ hybrid lily crosses. For all crosses, normal stigmatic pollination produced more seed set than did either intrastylar pollination method. For selfed flowers, intrastylar pollination methods generally resulted in more seed set but this was statistically nonsignificant. Significant reciprocal differences were found among crosses of ‘Harmony’, ‘Cinnabar’, and ‘Enchantment’ no reciprocal differences existed among ‘Joan Evans’ crosses. Seed set was highly correlated with pod width, length, and days to maturity.

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Abstract

Rate of pollen tube growth in styles of cross-pollinated rabbiteye (Vaccinium ashei Reade) and tetraploid highbush blueberries were adequate to induce a commercial fruit set when pollinated up to 6 days after emasculation. Varying intervals between emasculation and pollination, up to 6 days, did not consistently influence percentage fruit set and number of seeds produced per fruit.

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Abstract

Eight stamenless tomato mutants (Lycopersicon esculentum Mill.) were intercrossed in a half-diallel design to determine allelic relationships. Two allelic series were represented among the mutants. One series included sl, sl 2 , sl 5, cs, and fl. The 2nd series included bn, sl?, and pms. No allelic interactions occurred between members of the 2 series. Fruit and seed set resulting from cross-pollinations varied greatly among the mutants. The stamenless types, with the exception of sl 2, do not appear to be promising for use in producing hybrid tomato seed because of poor fruit and seed set.

Open Access