Articles
STUDIES ON RECIPROCAL EFFECTS ON BERRY AND TRUE POTATO SEED (TPS) CHARACTERISTICS IN POTATO
Article number
619_46
Pages
389 – 398
Language
English
Abstract
Reciprocal crosses involving three True Potato Seed (TPS) parental lines and two cultivars were studied for average berry weight, number of seeds/berry, 100 seed weight and proportion of seeds larger than 1/18”. Reciprocal differences were found among the parents for the type and degree of parental effects on these characters.
With Desiree as female, all the four males had the largest effect on berry weight, number of seeds/berry, average seed weight and proportion of seeds in >1/18” size.
Only with Desiree as female was metaxenia observed for berry weight with all four pollinators, observations being reported for the first time in potato.
A highly significant positive correlation was found between berry weight with the number of seeds/berry (r=0.82, p<0.01) and seed weight with the proportion of seeds larger than 1/18” (r=0.83, p<0.01), whereas other correlations among the characters were non-significant. Katahdin, TPS-13, TPS-67 and CEW-69.1 as the male and female parents in general increased average number of seeds/berry, 100 seed weight and proportion of seeds larger than 1/18&rdqou; in crosses, as compared to Desiree as male parent.
Better-parent and mid-parent heterosis (%) for 100 seed weight and proportion of seeds larger than 1/18” was calculated for each cross combination to study the phenomenon soon after fertilization.
Estimates of general and specific combining abilities were also calculated.
Results of the relative contributions of male and female parents to the seed characters, and the occurrence of heterosis in seed weight, can be of use in the selection of parental lines for hybrid TPS production.
Exploitation of heterosis for seed weight and size would add to improving the quality of hybrid TPS.
With Desiree as female, all the four males had the largest effect on berry weight, number of seeds/berry, average seed weight and proportion of seeds in >1/18” size.
Only with Desiree as female was metaxenia observed for berry weight with all four pollinators, observations being reported for the first time in potato.
A highly significant positive correlation was found between berry weight with the number of seeds/berry (r=0.82, p<0.01) and seed weight with the proportion of seeds larger than 1/18” (r=0.83, p<0.01), whereas other correlations among the characters were non-significant. Katahdin, TPS-13, TPS-67 and CEW-69.1 as the male and female parents in general increased average number of seeds/berry, 100 seed weight and proportion of seeds larger than 1/18&rdqou; in crosses, as compared to Desiree as male parent.
Better-parent and mid-parent heterosis (%) for 100 seed weight and proportion of seeds larger than 1/18” was calculated for each cross combination to study the phenomenon soon after fertilization.
Estimates of general and specific combining abilities were also calculated.
Results of the relative contributions of male and female parents to the seed characters, and the occurrence of heterosis in seed weight, can be of use in the selection of parental lines for hybrid TPS production.
Exploitation of heterosis for seed weight and size would add to improving the quality of hybrid TPS.
Authors
M.D. Upadhya, R. Cabello, E. Chujoy
Keywords
xenia, metaxenia, heterosis, combining abilities
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