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Fertility Improvement in Autotetraploids of Pea — Selection for Seed‐Set and Disjunction Index
Author(s) -
Kumar H.,
Mercykutty V. C.,
Srivastava C. P.
Publication year - 1993
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1993.tb00572.x
Subject(s) - biology , chiasma , selection (genetic algorithm) , horticulture , grain yield , cultivar , botany , agronomy , meiosis , genetics , gene , artificial intelligence , computer science
Four seed‐set groups of plants, viz. unselected ‘general’ and selected ‘high’, ‘medium’ and ‘low’ were constituted in C 1 generation from randomly selected autotetraploids of two pea cultivars, T 163 and 5064‐S. In C 2 generation, ten plants were selected at random in each of the four groups. Two seeds each from selected autotetraploids were drawn and bulked to make 20 seeds in each of the four groups to raise C 3 generation. Selection resulted in a gradual shift in seed‐set, though the magnitude and nature varied with the group and generation. Improvement in the seed‐set from C 1 to C 3 generation was associated with the increase in bivalents per cell, disjunction index and total chiasmata. Increase in total chiasmata was mostly due to an increase in proximal ones. Increase in seed‐set was reflected in improvement of grain yield per plant.