PHYSIOLOGICAL INVESTIGATION INTO THE VARIATION IN SPIKELET STERILITY/FERTILITY IN RICE (Oryza sativa L.)
Loading...
Date
2017-10-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Stress induced spikelet sterility is one of the serious problems in aerobic rice which
causes significant yield losses. Therefore, it warrants the development of suitable rice
varieties with reduced spikelet sterility for cultivation under aerobic conditions. In this
regard, the present study aimed at characterizing the rice germplasm under moisture
stress condition leading to identification of genotypes with reduced spikelet sterility.
Accordingly, genotypic variations in spikelet fertility/sterility was observed which paved
way for identification of contrasting germplasm differing in spikelet fertility/sterility.
Besides sterility, variation in growth and yield attributes including pollen viability and
leaf temperature was observed among rice germplasm. In fact, stress induced spikelet
sterility was found to be negatively correlated with pollen viability. In addition, seed
number and seed yield including relative stress tolerance to both desiccation and salt
stress was significantly more for high spikelet fertility genotypes than low fertility
genotypes. Further, although there was significant variation exists among rice germplasm
for methyl viologen induced oxidative stress, pollen viability and spikelet sterility are not
related to the oxidative stress tolerance of rice genotypes. Finally, with genotyping data,
QTLs for spikelet fertility and filled seed weight were identified which incidentally fallen
in line with already reported QTL’s.
Description
Keywords
null