Nitrogen and sulfur dynamics in two bread wheat genotypes with different stability against source/sink manipulation during grain filling

IF 6.4 1区农林科学 Q1 AGRONOMY

Field Crops Research Pub Date : 2025-10-06 DOI:10.1016/j.fcr.2025.110174

Agustín F. Arata , Laura Lázaro , Gabriela E. Tranquilli , Adriana C. Arrigoni , Mauro Martínez , María Inés Dinolfo , Deborah P. Rondanini

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引用次数: 0

Abstract

Context

Nitrogen and sulfur are critical yield-limiting factors that also impact the grain quality of bread wheat. The influence of the source/sink ratio on wheat grain weight has been widely studied, while its effect on quality parameters in genotypes with different baking aptitude has been addressed more recently, leaving processes to be unveiled.

Objective

This study aimed to analyze the nitrogen and sulfur dynamics to changes in the source/sink ratio during grain filling in two Argentinean wheat genotypes, previously characterized by their contrasting sensitivity to assimilate availability.

Methods

Field experiments were carried out during two growing seasons in Argentina under rainfed and nutrient sufficiency conditions. Three source/sink treatments were applied at seven days after anthesis: control, shading, and trimmed spikes. Determinations of nitrogen and sulfur were made on above-ground biomass, grain, and straw. Related variables were analyzed by linear regression.

Results

The genotype of good baking quality showed a greater capacity to accumulate both N and S in the grain (y-intercept) than the one of poor quality, without differences in their stability (slope) against source/sink ratio variations. Grain N demand was more dependent on the remobilization of nutrient reserves stored in pre-flowering (59 % on average), while grain S demand was more dependent on nutrient absorption in post-anthesis (75 % on average). However, the S remobilized fraction increased as stress conditions during grain filling intensified.

Conclusions

The carbon assimilate availability for grain growth during the filling period partially regulated the accumulation of N and S in the grain, although without genotypic differences in their stability against source-sink manipulation.

Implications

These findings are relevant to optimize the nutritional management of bread wheat crops aimed at productivity with baking quality.

查看原文本刊更多论文

灌浆期两种稳定性不同的面包小麦基因型对源库调控的氮硫动态

氮和硫是影响面包小麦品质的关键产量限制因素。源库比对小麦粒重的影响已经得到了广泛的研究，而其对不同烘焙倾向基因型品质参数的影响最近才得到解决，其过程尚待揭示。本研究旨在分析两种阿根廷小麦基因型籽粒灌浆过程中氮和硫对源/库比变化的动态变化。方法在阿根廷旱作和养分充足条件下，分两个生长季进行田间试验。在花后7天施用三种源汇处理：对照、遮荫和修剪穗。测定了地上生物量、谷物和秸秆的氮、硫含量。对相关变量进行线性回归分析。结果烘焙品质优良的基因型在籽粒中积累氮和硫的能力（y截距）大于烘焙品质差的基因型，其稳定性（斜率）对源汇比变化没有差异。籽粒氮素需求更依赖于花前营养储备的再调动（平均59 %），而籽粒S需求更依赖于花后营养吸收（平均75 %）。籽粒灌浆过程中，随着胁迫条件的加剧，S再激活率增加。结论灌浆期籽粒生长的碳同化物有效性在一定程度上调控了籽粒中氮和硫的积累，但对源库操作的稳定性无基因型差异。研究结果对优化面包小麦作物的营养管理具有一定的指导意义。

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.