Demonstrates improved lodging resistance and grain yield in rice by stacking dep1 with high-yielding genes, suggesting a promising breeding strategy.
Lodging tolerance is one of the most important goals in rice breeding. Due to its semidwarfism phenotype, dep1 can potentially improve lodging resistance. In this study, dep1 together with three high‐yielding alleles, gs3 , gn1a and ipa1 , was integrated into a high yield breeding strategy by conventional crossing, and four combinations including dep1 ‐ gn1a , dep1 ‐ gs3 , dep1 ‐ ipa1 and dep1 ‐ gs3 ‐ ipa1 were obtained. Though all the combinations showed plant phenotypes similar to dep1 , their 1000‐grain weights were observed to increase. Both dep1 ‐ ipa1 and dep1 ‐ gs3 ‐ ipa1 were characterized with improved lodging resistance and high yielding potential, whereas grain yield in both dep1 ‐ gn1a and dep1 ‐ gs3 dramatically decreased due to their low seed setting rates. Furthermore, specifically altered expression patterns of auxin and cytokinin related genes and abnormal stigma structure were found. Overall, the current study demonstrated the potential of pyramiding dep1 conferring lodging‐resistant traits with other high‐yield related genes, additionally providing a series of novel core germplasm for new insights into the interplay of dep1 , gn1a , gs3 and ipa1 in regulating rice morphogenesis.
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Li et al. (2026) studied this question.
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