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Seed priming alleviated salinity stress during germination and emergence of wheat (Triticum aestivum L.)
Agricultural Water Management ( IF 5.9 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.agwat.2020.106022
Faride Feghhenabi , Hashem Hadi , Habib Khodaverdiloo , Martinus Th. van Genuchten

Abstract Seed priming is known to often alleviate salinity stress during seed emergence and subsequent crop growth. This study compares the effects of salinity stress on the germination and emergence of wheat (Triticum aestivum L.) seeds untreated (control) and primed with ascorbic acid (Asc), potassium silicate (K2SiO3), proline (Pro), spermidine (Spd) and Lake Urmia saline water (LUsw). Saline water from Lake Urmia (Iran) was diluted to produce salinities with electrical conductivities (EC) of 2, 4, 6, 8, 10, 12, 14, 20 dS m−1, while distilled water (EC ≈ 0 dS m−1) was used for the control. Two independent sets of experiments were conducted. The first experiments were used to select the most effective concentration of each priming agent based on the final germination percentage (GP) and germination rate (GR). The second set of experiments aimed to analyze the measured data in terms of salinity response functions in order to quantitatively determine the most effective priming agent(s). The first experiments showed that the most effective concentrations of Spd (0.5 mM), Pro (25 mM), K2SiO3 (1.5 mM) and LUsw (100 mg L−1) mitigated the negative impacts of salinity on GR by 32, 18, 17 and 22 %, respectively. The second experiment showed that the Maas and Hoffman (1977) and van Genuchten and Hoffman (1984) salinity response functions provided effective descriptions of seedling and early growth response to salinity stress. Mean values of the salinity threshold (EC*) and the salinity at which a given trait was reduced by 50 percent (EC50) in these functions were 3.4 and 10.8 dS m−1 for the control, respectively. By comparison, the EC* values for the K2SiO3, Pro, Spd and LUsw primed seeds were 5.3, 4.5, 4.7, and 4.2 dS m−1, respectively, and the EC50 values were 12.4, 11.4, 11.9, and 9.4 dS m−1, respectively. The beneficial effects of K2SiO3 on seedling growth were more evident than those of the other priming agents. K2SiO3 had the highest effect on EC* and EC50 of the vitality index (VI), showing increases of 151 and 34 %, respectively. The highest increases of EC* and EC50 for seedling dry weight (72 and 24 %, respectively) were obtained with Spd and K2SiO3. The findings provide much insight on relieving the negative effects of salinity through cost-effective seed priming operations so as to improve the production of wheat under saline conditions.

中文翻译:

种子引发减轻了小麦(Triticum aestivum L.)发芽和出苗过程中的盐分胁迫

摘要 众所周知,种子引发剂通常可以缓解种子萌发和随后的作物生长过程中的盐分胁迫。本研究比较了盐分胁迫对未经处理(对照)和用抗坏血酸 (Asc)、硅酸钾 (K2SiO3)、脯氨酸 (Pro)、亚精胺 (Spd) 处理的小麦 (Triticum aestivum L.) 种子发芽和出苗的影响和乌尔米亚湖盐水(LUsw)。来自乌尔米亚湖(伊朗)的盐水被稀释以产生电导率 (EC) 为 2、4、6、8、10、12、14、20 dS m-1 的盐度,而蒸馏水 (EC ≈ 0 dS m-) 1) 用于控制。进行了两组独立的实验。第一个实验用于根据最终发芽率 (GP) 和发芽率 (GR) 选择每种引发剂的最有效浓度。第二组实验旨在分析盐度响应函数方面的测量数据,以便定量确定最有效的引发剂。第一个实验表明,最有效的 Spd (0.5 mM)、Pro (25 mM)、K2SiO3 (1.5 mM) 和 LUsw (100 mg L-1) 浓度在 32、18、17 年减轻了盐度对 GR 的负面影响和 22%,分别。第二个实验表明 Maas 和 Hoffman (1977) 以及 van Genuchten 和 Hoffman (1984) 的盐度响应函数提供了幼苗和早期生长对盐分胁迫的响应的有效描述。在这些函数中,盐度阈值 (EC*) 和给定性状降低 50% 时的盐度 (EC50) 的平均值分别为对照的 3.4 和 10.8 dS m-1。相比之下,K2SiO3 的 EC* 值,Pro、Spd 和 LUsw 引发的种子分别为 5.3、4.5、4.7 和 4.2 dS m-1,EC50 值分别为 12.4、11.4、11.9 和 9.4 dS m-1。K2SiO3 对幼苗生长的有益作用比其他引发剂更明显。K2SiO3 对活力指数 (VI) 的 EC* 和 EC50 的影响最大,分别增加了 151% 和 34%。幼苗干重的 EC* 和 EC50 增幅最高(分别为 72% 和 24%)是通过 Spd 和 K2SiO3 获得的。这些发现为通过具有成本效益的种子引发操作减轻盐度的负面影响提供了很多见解,以提高盐度条件下小麦的产量。K2SiO3 对幼苗生长的有益作用比其他引发剂更明显。K2SiO3 对活力指数 (VI) 的 EC* 和 EC50 的影响最大,分别增加了 151% 和 34%。幼苗干重的 EC* 和 EC50 增幅最高(分别为 72% 和 24%)是通过 Spd 和 K2SiO3 获得的。这些发现为通过具有成本效益的种子引发操作减轻盐度的负面影响提供了很多见解,以提高盐度条件下小麦的产量。K2SiO3 对幼苗生长的有益作用比其他引发剂更明显。K2SiO3 对活力指数 (VI) 的 EC* 和 EC50 的影响最大,分别增加了 151% 和 34%。幼苗干重的 EC* 和 EC50 增幅最高(分别为 72% 和 24%)是通过 Spd 和 K2SiO3 获得的。这些发现为通过具有成本效益的种子引发操作减轻盐度的负面影响提供了很多见解,以提高盐度条件下小麦的产量。分别) 用 Spd 和 K2SiO3 获得。这些发现为通过具有成本效益的种子引发操作减轻盐度的负面影响提供了很多见解,以提高盐度条件下小麦的产量。分别) 用 Spd 和 K2SiO3 获得。这些发现为通过具有成本效益的种子引发操作减轻盐度的负面影响提供了很多见解,以提高盐度条件下小麦的产量。
更新日期:2020-03-01
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