Physiological and yield parameters of wheat as affected by tiller removal and defoliation

IF 0.7 4区农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY

Pesquisa Agropecuaria Brasileira Pub Date : 2023-08-25 DOI:10.1590/s1678-3921.pab2023.v58.03156

S. L. Fioreze, Iury Borga, Elisandra Cristina Ribeiro

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Abstract

Abstract The objective of this work was to evaluate the photosynthetic parameters, yield potential, and response to defoliation of wheat (Triticum aestivum) plants subjected to tiller removal. Two experiments were conducted under greenhouse conditions. In the first, the two following cultivars were evaluated for complete tiller removal: TBIO Audaz and BRS 394, with a high and low tillering capacity, respectively. In the second, only 'TBIO Audaz' was subjected to detillering and defoliation at post-anthesis. Tiller removal increased the yield potential of the main stem of both tested cultivars and the CO2 assimilation potential of the flag leaf, which was possibly a strategy to meet the demands for an increased sink strength, as evidenced by the response curves to irradiance and leaf internal CO2 concentration. The partial defoliation of 'TBIO Audaz' increased daily CO2 assimilation, both in intact and detillered plants. Detillered plants show a higher photosynthetic and yield potential of the main stem, but also a greater sensitivity to defoliation in the post-anthesis period.

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分蘖和落叶对小麦生理和产量参数的影响

摘要本研究旨在探讨小麦(Triticum aestivum)分蘖去除后植株的光合参数、产量潜力及其对叶片脱落的响应。在温室条件下进行了两项试验。首先，对分蘖能力高、分蘖能力低的TBIO Audaz和BRS 394进行了分蘖能力评价。在第二种情况下，只有“TBIO Audaz”在花后经历了脱毛和落叶。分蘖去除增加了两个品种主茎的产量势和旗叶的CO2同化势，这可能是为了满足增加汇强度的需求，从对辐照度和叶片内部CO2浓度的响应曲线可以看出。“TBIO Audaz”的部分落叶增加了完整植株和去叶植株的日二氧化碳同化。除茎植物的主茎具有较高的光合作用和产量潜力，但对花期后的落叶也更敏感。

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来源期刊

Pesquisa Agropecuaria Brasileira 农林科学-农业综合

CiteScore

1.20

自引率

0.00%

发文量

审稿时长

9-18 weeks

期刊介绍： Pesquisa Agropecuária Brasileira – PAB – is issued monthly by Empresa Brasileira de Pesquisa Agropecuária – EMBRAPA, affiliated to Ministry of Agriculture, Livestock and Food Supply. PAB publishes original scientific-technological articles on Plant Physiology, Plant Pathology, Crop Science, Genetics, Soil Science, Food Technology and Animal Science. Its abbreviated title is Pesq. agropec. bras., and it should be used in bibliographies, footnotes, references and bibliographic strips.