Source and sink traits and their relationship under deficit soil moisture stress conditions in an indeterminate crop: sesame (Sesamum indicum L.)

IF 1.6 3区农林科学 Q2 AGRONOMY

Plant Production Science Pub Date : 2023-04-03 DOI:10.1080/1343943X.2023.2203404

Gopika Karnan, R. Pasala, B. Pandey, Manikanta ChLn, Ramya Kt, Rathnakumar Al, A. Guhey

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引用次数: 1

Abstract

ABSTRACT Sesame is an indeterminate oilseed crop where yield is determined by source and its capacity for synthesis and mobilization of photosynthates. Knowledge of the existing relation between source and sink and its validation under deficit soil moisture conditions is limited in sesame. Therefore, experiments were conducted using 25 sesame genotypes with differing plant architecture in terms of branching pattern (mono to multiple) and leaf area (minimum to maximum) under both irrigated (IR) and deficit soil moisture stress (DS) conditions for two consecutive years 2021 and 2022. The variations existing among the source and sink traits were measured, and the ANOVA of the measured traits revealed a significant differences among the genotypes for source traits, viz. leaf area, stem and leaf dry weight, net photosynthesis, total dry matter and their relationship with sink, i.e. seed yield under IR and DS conditions, and it was further confirmed using regression analysis. The results showed, certain source traits viz., stem dry weight and total dry matter at seed filling stage were positively associated with seed yield at both IR and DS conditions. Additionally, cluster analysis showed that the genotypes IC 54039-B-1 and SI 1802 had a proportional leaf area with good seed yield and displayed a better source and sink relationship, highlighting the fact that photosynthates were efficiently translocated to the sink. The genotypes IC 54039-B-1 and SI 1802 outperformed IR under DS with minimal yield differences and optimal leaf weight, total dry matter, and plant stem weight. These genotypes with better source and sink relationships can be used in sesame crop improvement programmes. GRAPHICAL ABSTRACT

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不确定作物芝麻(Sesamum indicum L.)亏缺土壤水分胁迫下源汇特性及其关系

芝麻是一种不确定的油籽作物，其产量取决于来源及其光合产物的合成和动员能力。芝麻对源汇关系的认识及其在土壤水分亏缺条件下的验证是有限的。因此，在2021年和2022年连续两年在灌溉(IR)和亏缺土壤水分胁迫(DS)条件下，采用25个具有不同植株结构(单枝到多枝)和叶面积(最小到最大)的芝麻基因型进行了试验。测量了源库性状之间存在的差异，方差分析显示，IR和DS条件下源库性状(叶面积、茎叶干重、净光合作用、总干物质及其与库(即种子产量)的关系在基因型之间存在显著差异，并通过回归分析进一步证实了这一差异。结果表明，灌浆期茎秆干重和总干物质与种子产量均呈显著正相关。聚类分析表明，IC 54039-B-1和SI 1802基因型的叶面积与种子产量成正比，且源库关系较好，说明光合产物能有效地转移到库中。基因型IC 54039-B-1和SI 1802在DS条件下表现优于IR，产量差异最小，叶重、总干物质和茎重最佳。这些源库关系较好的基因型可用于芝麻作物改良项目。图形抽象

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来源期刊

Plant Production Science 农林科学-农艺学

CiteScore

5.10

自引率

4.00%

发文量

审稿时长

>36 weeks

期刊介绍： Plant Production Science publishes original research reports on field crops and resource plants, their production and related subjects, covering a wide range of sciences; physiology, biotechnology, morphology, ecology, cropping system, production technology and post harvest management. Studies on plant production with special attention to resource management and the environment are also welcome. Field surveys on cropping or farming system are also accepted. Articles with a background in other research areas such as soil science, meteorology, biometry, product process and plant protection will be accepted as long as they are significantly related to plant production.