Effects of Exogenous Brassinolide Application at the Silking Stage on Nutrient Accumulation, Translocation and Remobilization of Waxy Maize under Post-Silking Heat Stress

Yueming Xu, Xiaoyu Zhang, Huan Yang and Dalei Lu
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Yueming Xu: Jiangsu Key Laboratory of Crop Genetics and Physiology, Jiangsu Key Laboratory of Crop Cultivation and Physiology, Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Agricultural College of Yangzhou University, Yangzhou 225009, China
Xiaoyu Zhang: Jiangsu Key Laboratory of Crop Genetics and Physiology, Jiangsu Key Laboratory of Crop Cultivation and Physiology, Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Agricultural College of Yangzhou University, Yangzhou 225009, China
Huan Yang: Jiangsu Key Laboratory of Crop Genetics and Physiology, Jiangsu Key Laboratory of Crop Cultivation and Physiology, Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Agricultural College of Yangzhou University, Yangzhou 225009, China
Dalei Lu: Jiangsu Key Laboratory of Crop Genetics and Physiology, Jiangsu Key Laboratory of Crop Cultivation and Physiology, Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Agricultural College of Yangzhou University, Yangzhou 225009, China

Agriculture, 2022, vol. 12, issue 5, 1-14

Abstract: Exogenous brassinolide (BR) application is a feasible measure to alleviate abiotic stresses on crop productivity. The effects of BR application at the silking-stage on the accumulation, translocation, and remobilization of dry matter (DM) and nutrients (nitrogen, phosphorus, and potassium) of waxy maize exposed to post-silking high temperature (HT) were studied using Jingkenuo2000 (JKN2000, heat-tolerant) and Yunuo7 (YN7, heat-sensitive) as materials. BR application mitigated the penalty of HT on grain yield. HT reduced the post-silking accumulation and increased the translocation of pre-silking DM and nutrients in YN7. In JKN2000, accumulation and remobilization of DM were unaffected by HT. The contribution rate of DM and nutrients translocation to grain yield were unaffected by HT in JKN2000 and increased in YN7. Under HT, the accumulation, translocation, and remobilization of DM were unaffected by BR application, whereas the nitrogen, phosphorus, and potassium response were dependent on hybrids. The harvest index of DM and nutrients in response to HT and BR were different between the two hybrids. In conclusion, BR application relieved the negative effects of HT mainly caused by the increased post-silking accumulation and remobilization of DM and nitrogen, and the alleviation was more obvious in the heat-tolerant hybrid.

Keywords: brassinolide; dry matter; high temperature; nutrient; waxy maize (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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