MALE STERILITY INDUCING CYTOPLASM EFFECTS ON PRODUCTIVITY PER SE TRAITS IN PIGEONPEA (Cajanus cajan L. Millsp.)
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Date
2019-08-24
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UNIVERSITY OF AGRICULTURAL SCIENCES, GKVK BENGALURU
Abstract
Hybrids cultivar development through CGMS system should be devoid of any
undesirable cytoplasmic effects on grain yield and its component traits. To know the
cytoplasmic effects if any in pigeonpea, a comparative assessment of CGMS- based
hybrids with their maintainer counterparts in isogenic background was carried out. Male
sterility inducing cytoplasmic effects on parental gca effects, hybrid mean performance,
sca effects and mid parent heterosis for grain yield and its component traits was
investigated by evaluating 30 pigeonpea alloplasmic hybrids (15 each of A × R and B × R
crosses involving 3 CMS (A) lines and their maintainer (B) lines and 5 restorers (R) lines
along with standard check variety BRG 5 at experimental plots of ZARS, UAS, GKVK,
Bengaluru. Expression of pod bearing length and pods plant-1 were influenced by
cytoplasm as A and B lines differed significantly for their gca effects in all three nuclear
genetic backgrounds. Significant variation was observed within A × R and B × R group of
hybrids for all the traits. There was no significant difference between A × R and B × R
hybrids for overall mean performance and sca effects but for mid parent heterosis
cytoplasm influenced the expression of few characters. The direction and magnitude of
significant differences were observed in few nuclear genetic backgrounds for the traits
were varied and not favoured any particular cytoplasm, indicating no influence of
cytoplasm on the expression of hybrids used in the study.