Journal
PLANTS-BASEL
Volume 11, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/plants11101291
Keywords
foliar application; growth regulator; CMS line; hybrid rice; floral traits; grain yield; principal component analysis
Categories
Funding
- Rice Research Department, Field Crops Research Institute, Agricultural Research Center, Egypt
- Deanship of Scientific Research at Shaqra University
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This study aimed to explore the impact of exogenous plant growth regulators on floral traits and outcrossing rates in rice CMS lines. The results showed that the combination of GA(3), IAA, and NAA significantly improved floral, growth, and yield traits in all tested CMS lines, especially for promising lines such as L2, L3, and L1.
Cytoplasmic male sterility (CMS) provides an irreplaceable strategy for commercial exploitation of heterosis and producing high-yielding hybrid rice. The exogenous application of plant growth regulators could improve outcrossing rates of the CMS lines by affecting floral traits and accordingly increase hybrid rice seed production. The present study aimed at exploring the impact of growth regulators such as gibberellic acid (GA(3)), indole-3-acetic acid (IAA), and naphthalene acetic acid (NAA) on promoting floral traits and outcrossing rates in diverse rice CMS lines and improving hybrid rice seed production. The impact of foliar applications of growth regulators comprising GA(3) at 300 g/ha or GA(3) at 150 g/ha + IAA at 50 g/ha + NAA at 200 g/ha versus untreated control was investigated on floral, growth, and yield traits of five diverse CMS lines. The exogenously sprayed growth regulators, in particular, the combination of GA(3), IAA, and NAA (T3) boosted all studied floral, growth, and yield traits in all tested CMS lines. Moreover, the evaluated CMS lines exhibited significant differences in all measured floral traits. L2, L3, and L1 displayed the uppermost spikelet opening angle, duration of spikelet opening, total stigma length, style length, stigma brush, and stigma width. In addition, these CMS lines exhibited the highest plant growth and yield traits, particularly under T3. Consequently, exogenous application of GA(3), IAA, and NAA could be exploited to improve the floral, growth, and yield traits of promising CMS lines such as L2, L3, and L1, hence increasing outcrossing rates and hybrid rice seed production.
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