Genotypic differences in soybean (Glycine max L.) in yield response to phosphorus fertilizer are associated with difference in biomass and phosphorus content
Lin-Wei Xu , Jiayin Pang , Neil C. Turner , Hans Lambers , Jin He
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引用次数: 0
Abstract
The soybean seed yield response to phosphorus (P) fertilizer has significantly increased during soybean breeding but the underlying mechanisms remain elusive. In this study, we used two soybean cultivars with high (Andou 8 (AD8)) and low (Qiandou 5 (QD5)) seed yield response to P fertilizer to compare their yield and yield components, biomass accumulation and partitioning, P content and partitioning and P-use efficiency in Shiqian (SQ) and Dafang (DF) during the growing season in 2020 under 0 (P0) and 35 (P35) kg P ha−1 supply. The results show that AD 8 had a greater seed yield, pod biomass, filled-pod number, seed number, pod P content and P partitioning to pods, and P-use efficiency based on seed yield (PUESY) but lower P-use efficiency based on biomass (PUEB) than QD5 at two experimental sites. The seed number was positively correlated with total biomass and P content, especially with greater pod biomass accumulation and its partition to pods which showed a positive correlation with seed number. Seed number was negatively correlated with stem dry weight and its partitioning to stem, and stem P partition. We conclude (1) different yield response to P fertilizer are explained by different biomass and P content and their partitioning to pod; (2) high biomass and P-conversion efficiency increased the seed number, which accounted for a high yield response to P fertilizer. Our results highlight that soybean breeding increased biomass and nutrient content and their conversion efficiency to achieve high seed yield with P-fertilizer supply.
在大豆育种过程中,大豆籽粒产量对磷肥的响应显著提高,但其潜在机制仍不清楚。本研究利用安豆 8 号(AD8)和黔豆 5 号(QD5)这两个对磷肥响应较高的大豆品种,比较了 2020 年石阡(SQ)和大方(DF)大豆生长季在 0(P0)和 35(P35) kg P ha-1 供肥条件下的产量和产量组成、生物量积累和分配、磷含量和分配以及磷利用效率。结果表明,与 QD5 相比,AD 8 在两个试验点的种子产量、荚果生物量、饱满荚果数、种子数、荚果 P 含量和荚果 P 分配以及基于种子产量的 P 利用效率(PUESY)都更高,但基于生物量的 P 利用效率(PUEB)较低。种子数与总生物量和钾含量呈正相关,尤其是豆荚生物量积累和豆荚钾分配与种子数呈正相关。种子数与茎干重及其在茎中的分配和茎钾分配呈负相关。我们的结论是:(1)不同的生物量和钾含量及其在豆荚中的分配情况解释了对钾肥的不同产量响应;(2)高生物量和钾转化效率增加了种子数,这是对钾肥的高产响应的原因。我们的研究结果突出表明,大豆育种提高了生物量和养分含量及其转化效率,从而在提供钾肥的情况下实现了高产。