Impact of salinity on yield-related parameters in two contrasting cultivars of Oryza glaberrima Steud. in Benin

IF 1.6 4区农林科学 Q1 Agricultural and Biological Sciences

Experimental Agriculture Pub Date : 2023-03-14 DOI:10.1017/S0014479723000030

Hermann Prodjinoto, C. Gandonou, Willy Irakoze, S. Lutts

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引用次数: 0

Abstract

Summary Salinity is one of the major environmental stresses limiting growth and yield of rice. The objective of the present study was to analyze the impact of NaCl on yield-related parameters of Oryza glaberrima. Two contrasted cultivars of Oryza glaberrima previously tested for salt resistance at the vegetative stage [salt-resistant (TOG5307) and salt-sensitive (TOG5949)] were irrigated with a saline solution containing 30 mM NaCl (EC: 3 dS.m−1 NaCl). After 6 months of treatments, mineral nutrient and yield-related parameters were assessed. Proline was quantified in the panicle leaf at the start of the grain filling stage. NaCl treatment affected most yield-related parameters: panicle length, panicle leaf dry weight, number of branches per panicle, panicle leaf length, days to 50% heading, straw fresh weight per plant, grain yield per plant, number of spikelets per panicle, and number of filled grains per panicle. The weight of 1,000 grains decreased in the salt-sensitive cultivar only, suggesting that grain filling processes were compromised. The salt-resistant cultivar TOG5307 was less affected than the salt-sensitive TOG5949 and accumulated lower amounts of Na+ in the grains. For both cultivars, hulls contained higher concentration of Na+ and K+ than grains. TOG5307 also contained more proline in the panicle leaf than TOG5949, suggesting that TOG5307 can cope with the osmotic component of salt stress. The cultivar exhibiting the highest salt resistance at the vegetative stage also exhibited the highest resistance at the reproductive one.

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盐度对两个对照品种光蒿产量相关参数的影响。在贝宁

盐分是限制水稻生长和产量的主要环境胁迫之一。本研究的目的是分析NaCl对水稻产量相关参数的影响。用含有30 mM NaCl（EC:3 dS.m−1 NaCl）的盐水溶液灌溉先前在营养期测试耐盐性的两个对比品种[耐盐（TOG5307）和盐敏（TOG5949）]。经过6个月的处理后，对矿物质营养和产量相关参数进行了评估。在籽粒灌浆阶段开始时，对穗叶中的脯氨酸进行了定量。NaCl处理对产量相关参数影响最大：穗长、穗叶干重、每穗分枝数、穗叶长、50%抽穗天数、单株秸秆鲜重、单株产量、每穗小穗数和每穗实粒数。只有对盐敏感的品种1000粒的重量下降，这表明籽粒灌浆过程受到了影响。耐盐品种TOG5307的影响小于对盐敏感的品种TOG5949，并且在籽粒中积累的Na+量较低。对于这两个品种，外壳中Na+和K+的浓度都高于谷物。TOG5307在穗叶中也比TOG5949含有更多的脯氨酸，这表明TOG5307可以应对盐胁迫的渗透成分。在营养期表现出最高抗盐性的品种在繁殖期也表现出最高的抗盐性。

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来源期刊

Experimental Agriculture 农林科学-农艺学

CiteScore

2.50

自引率

6.20%

发文量

审稿时长

24 months

期刊介绍： With a focus on the tropical and sub-tropical regions of the world, Experimental Agriculture publishes the results of original research on field, plantation and herbage crops grown for food or feed, or for industrial purposes, and on farming systems, including livestock and people. It reports experimental work designed to explain how crops respond to the environment in biological and physical terms, and on the social and economic issues that may influence the uptake of the results of research by policy makers and farmers, including the role of institutions and partnerships in delivering impact. The journal also publishes accounts and critical discussions of new quantitative and qualitative methods in agricultural and ecosystems research, and of contemporary issues arising in countries where agricultural production needs to develop rapidly. There is a regular book review section and occasional, often invited, reviews of research.