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Evaluation of drought resistance in safflower (Carthamus tinctorius L.) genotypes under field conditions

机译：田间条件下红花（Carthamus tinctorius L.）基因型的抗旱性评估

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In order to evaluate drought resistance indices in eight safflower {Carthamus tinctorius L.) genotypes were evaluated in a split plot design with three replications in two levels of irrigation, one with stress and the other without stress at the Islamic Azad University of Shoushtar, Iran, research farm in the year 2014. To evaluate drought tolerance genotypes on the basis of yield performance in stressed (ys) and non-stressed (yp) environments, quantitative measures of drought tolerance i. e. mean productivity (MP), stress tolerance (TOL), geometric mean productivity (GMP), stress susceptibility index (SSI) and tolerance index (STI) were computed. The analysis of variance showed that the genotypes had significant differences in all the traits. Drought had highly significant difference on all of the studied traits except number of seeds per capsule. The highest and lowest means of grain yield were 356s6 (787 kg/ha) and 376 (362.2 kg/ha), respectively. The highest values of SSI were observed in 357s6and 27-N and the lowest values of SSI were observed in Pi-258 and KW 13. These genotypes could be proposed as tolerant genotypes to drought stress. Pi-258 and KW 13 with a smaller value of TOL were identified as the most tolerant genotypes, while 44 and376 with the highest TOL value were the most sensitive genotypes.The results indicated that MP, STI and GMP had a significant (P<0.01) positive correlation with yield under non-stress and stressed conditions indicating that these indices are suitable criteria for screeningdrought tolerant genotypes.
机译：为了评估八种红花基因（Carthamus tinctorius L.）的抗旱指数，在伊朗伊斯兰阿沙德大学的伊斯兰阿沙德大学，采用分块设计，在两个灌溉水平上进行了三个重复试验，其中一个试验有压力，另一个试验无压力。 ，研究农场在2014年。要根据在胁迫（ys）和非胁迫（yp）环境下的产量表现来评估耐旱基因型，对耐旱性的定量衡量指标为i。 e。计算了平均生产率（MP），应力承受能力（TOL），几何平均生产率（GMP），应力敏感性指数（SSI）和耐受指数（STI）。方差分析表明，基因型在所有性状上都有显着差异。除每个胶囊的种子数量外，干旱在所有研究的性状上均具有高度显着差异。最高和最低谷物平均产量分别为356s6（787 kg / ha）和376（362.2 kg / ha）。在357s6和27-N观察到最高的SSI值，在Pi-258和KW 13观察到最低的SSI值。这些基因型可以被认为是耐干旱胁迫的基因型。 TOL值较小的Pi-258和KW 13被确定为最耐受的基因型，TOL值最高的Pi-258和KW 13是最敏感的基因型，结果表明MP，STI和GMP显着（P <0.01 ）在非胁迫和胁迫条件下与产量呈正相关，表明这些指数是筛选耐旱基因型的合适标准。

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