The paper studied the effects of drought stress, selenium (Se) supply and their combination on growth and physiological characteristics of wheat ( Triticum aestivum L. cv Shijiazhuang NO. 8) seedlings. The experimental design included two water treatments (well-watered, 75% of maximum field capacity; drought stress, 30% of maximum field capacity) and two Se levels (0; 0.5 mg/kg) to determine whether Se can modify the negative impacts of drought stress on seedling growth and physiological traits. Drought stress caused a marked decline in growth parameters and soluble protein content, whereas it induced an increase in root activity, proline content and the activities of peroxidase (POD) and catalase (CAT) of leaf tissue. On the other hand, Se supply induced an increase in biomass accumulation only under well-watered condition. Under drought stress, Se supply increased free proline content, root activity and the activities of POD and CAT in leaf tissue, but did not significantly affect on growth parameters. These results implied that drought stress brought harmful effects on wheat seedlings, and that Se supply was favorable for biomass accumulation of wheat seedlings under well-watered condition. However, it did not significantly affect on biomass accumulation under drought stress, although it increased root activity and activities of some antioxidant index in experimental periods.

中文翻译：

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干旱和硒供应对小麦幼苗生长和生理特性的影响

在研究了干旱胁迫，硒（Se）供给及其对小麦的生长和生理特性组合的作用（ 小麦 L. cv石家庄 8）幼苗。实验设计包括两种水处理（浇水充足，占最大田间耕种量的75％；干旱胁迫，占最大田间耕种量的30％）和两个硒水平（0； 0.5 mg / kg），以确定硒是否可以改变负面影响胁迫对幼苗生长和生理特性的影响 干旱胁迫导致生长参数和可溶性蛋白质含量显着下降，而诱导根系活性，脯氨酸含量以及叶片组织的过氧化物酶（POD）和过氧化氢酶（CAT）活性增加。另一方面，硒的供应仅在灌溉条件良好的条件下才引起生物量积累的增加。在干旱胁迫下，硒的供应增加了叶片组织中脯氨酸的含量，根系活性以及POD和CAT的活性，但对生长参数没有显着影响。这些结果表明干旱胁迫对小麦幼苗产生了有害影响，硒的供应有利于水分充足条件下小麦幼苗的生物量积累。然而，尽管它在实验期间增加了根系活性和某些抗氧化指数的活性，但对干旱胁迫下的生物量积累没有明显影响。