Comparative performance of δ¹³C, ion accumulation and agronomic parameters for phenotyping durum wheat genotypes under various irrigation water salinities

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• 作者：Z. Chamekh ; C. Karmous ; S. Ayadi ; A. Sahli ; M. Belhaj Fraj ; S. Yousfi ; S. Rezgui ; N. Ben Aissa ; M.D. Serret ; I. McCann ; Y. Trifa ; H. Amara and J.L. Araus
• 刊名：Annals of Applied Biology
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：170
• 期：2
• 页码：229-239
• 全文大小：331K
• ISSN：1744-7348

文摘

The use of efficient selection traits for screening under contrasting irrigation water salinity is a challenge for breeders. To identify patterns, grain yield (GY) and yield components (kernels m⁻², thousand kernels weight), growth traits (plant height, biomass), flag leaf ion accumulation (Na⁺ and K⁺), carbon isotope composition (δ¹³C_grain) and nitrogen concentration (N_grain) of grains were assessed on 25 durum wheat genotypes (G) in two consecutive growing seasons (2010 and 2011), in three semi-arid locations in Tunisia. Each location differed in their irrigation water salinity as measured by electrical conductivity: Echbika (S1, 6 dS m⁻¹), Barrouta (S2, 12 dS m⁻¹) and Sidi Bouzid (S3, 18 dS m⁻¹). GY was shown to be negatively correlated to N_grain as well as to δ¹³C_grain. This is confirmed by a multiple linear regression analysis that showed that both δ¹³C_grain and N_grain were the major determinant components for GY variability under S3. A high genotypic variability was observed and the improved genotype Maali exhibited the most stable GY under the three irrigation water salinities and the two cropping seasons. Maali showed the lowest δ¹³C_grain. This indicates that tolerance in durum wheat is likely to be correlated to the ability of maintaining a high stomatal conductance. According to our data suggests δ¹³C_grain can be used for an efficient screening of salt tolerant durum wheat. Under our experimental conditions, N_grain was shown to be highly correlated to δ¹³C_grain and can therefore be easier-to-use trait to assess the tolerance to salinity.