The potential of EDAH in promoting kernel formation and grain yield in summer maize

IF 5.6 1区农林科学 Q1 AGRONOMY

Field Crops Research Pub Date : 2024-11-11 DOI:10.1016/j.fcr.2024.109655

Xingxing Wang , Guangnuan Song , Saud Shah , Hao Ren , Baizhao Ren , Jiwang Zhang , Peng Liu , Bin Zhao

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引用次数: 0

Abstract

Context or problem

Enhancing crop yield by increasing planting density has long been a widely accepted agricultural practice. However, high-density planting is prone to problems, such as increased intraspecific competition. Growth regulators are often used to mitigate the challenges posed by heightened intraspecific competition and the negative effects on kernel setting and final yield associated with dense planting. However, the exact mechanisms of these growth regulators in kernel formation remain unclear.

Objective

The aim of this study was to investigate the regulatory effects of EDAH on spike differentiation and fertilization in summer maize.

Methods

Denghai605 (DH605) and Xianyu335 (XY335) were used as the experimental materials at two planting densities (D1:60,000 plants ha⁻¹ and D2:90,000 plants ha⁻¹), and EDAH was sprayed at different stages (6th, 9th, and 12th leaf stages). Spike differentiation characteristics, grain-filling characteristics, SPAD, stalk cross-sectional area, and yield were determined.

Results

Spraying EDAH at a high planting density (D2) significantly increased the yield of maize, especially after spraying at 9th leaf stage (S2), and the yields of XY335 and DH605 increased by 21.55 % and 12.64 %, respectively, compared with CK. Spraying EDAH accelerated the ear differentiation process and fertilization rate, with the percentage of male tasseling increasing from 3.29 % to 10.33 % and the percentage of female silking increasing by 4.12–15.98 %. The fertilization rate of florets increased by 4.39–7.77 %, and the number of grains per ear increased significantly. In addition, EDAH spraying increased the SPAD value by 1.67–7.70 %, and the cross-sectional area of the third internode increased by 7.83–26.22 %.

Conclusion

Spraying EDAH to promote ear differentiation and optimize physiological characteristics is beneficial for improving the grain-filling rate and ultimately increasing yield. The most significant increase in yield was achieved by spraying EDAH at the 9th leaf stage and was particularly pronounced in the lodging-susceptible variety (XY335).

Implications or significance

These results provide new insights into high-efficiency cultivation methods for varieties with high yield potential but poor density tolerance.

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EDAH 在促进夏玉米籽粒形成和提高产量方面的潜力

背景或问题长期以来，通过提高种植密度来提高作物产量一直是广为接受的农业实践。然而，高密度种植容易出现问题，如种内竞争加剧。通常使用生长调节剂来缓解种内竞争加剧带来的挑战，以及密集种植对结实率和最终产量的负面影响。方法以登海605（DH605）和先玉335（XY335）为试验材料，按照两种种植密度（D1:60,000株/公顷-1和D2:90,000株/公顷-1），在不同阶段（第6、9和12叶期）喷施EDAH。结果在高种植密度（D2）下喷施EDAH能显著提高玉米产量，尤其是在第9叶期（S2）喷施后，XY335和DH605的产量分别比CK提高了21.55%和12.64%。喷施 EDAH 加快了穗分化进程和受精率，雄花抽穗率从 3.29 % 提高到 10.33 %，雌花吐丝率提高了 4.12-15.98 %。小花受精率提高了 4.39-7.77 %，每穗粒数显著增加。此外，喷施 EDAH 可使 SPAD 值增加 1.67-7.70 %，第三节间横截面积增加 7.83-26.22 %。在第 9 叶期喷洒 EDAH 的增产效果最为明显，尤其是在易倒伏品种（XY335）上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Field Crops Research 农林科学-农艺学

CiteScore

9.60

自引率

12.10%

发文量

307

审稿时长

46 days

期刊介绍： Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.