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盐分和水分胁迫对两种盐生植物盐爪爪和盐穗木种子萌发的影响

曾幼玲;蔡忠贞;马纪;张富春;王波   

  1. 新疆大学生命科学与技术学院分子生物学重点实验室, 乌鲁木齐 830046
  • 收稿日期:2005-12-28 修回日期:2006-05-30 出版日期:2006-09-10 发布日期:2006-09-10

Effects of salt and water stress on seed germination of halophytes Kalidium foliatum and Halostachys caspica

ZENG Youling; CAI Zhongzhen; MA Ji; ZHANG Fuchun; WANG Bo   

  1. Key Laboratory of Molecular Biology, College of Life Science and Technology, Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, Xinjiang University, Urumqi 830046, China

  • Received:2005-12-28 Revised:2006-05-30 Online:2006-09-10 Published:2006-09-10

摘要: 采用不同浓度NaCl和等渗PEG(分子量为6000)处理2种盐生植物种子(盐爪爪Kalidium foliatum、盐穗木Halostachys caspica)。结果表明,(1)NaCl和等渗PEG对种子的萌发均产生抑制作用,且PEG的抑制程度大于等渗NaCl,说明渗透胁迫是影响盐生植物种子萌发的主要因素;(2)盐胁迫和水分胁迫对盐生植物种子的萌发具有明显的抑制作用,降低了种子的萌发率,推迟了种子的初始萌发时间、延长了种子的萌发时间;(3)根据2种盐生植物种子萌发耐盐性比较,两种盐生植物均具有较强的耐盐性,在0~300 mmol·L-1 NaCl盐溶液范围内,盐穗木种子相对萌发率达到95%以上,盐爪爪达到80%以上,说明盐穗木比盐爪爪具有更强的耐盐性。盐穗木种子耐盐适宜值为332.5mmol·L-1,临界值为540mmol·L-1 ,极限值为749 mmol·L-1;盐爪爪种子耐盐适宜值为246.5 mmol·L-1,临界值为391.8 mmol·L-1,极限值为537 mmol·L-1;(4)低浓度的NaCl溶液对种子萌发的幼苗生长起着促进作用。在100 mmol·L-1 NaCl处理时,两种盐生植物幼苗的胚根和幼芽长度达到最大值,幼苗的生长状况也最好。

Abstract: The study showed that after, the seed germination of two halophytes kalidium foliatum and Halostachys caspica treated with different concentration NaCl solutions and iso-osmotic PEG was inhibited, and iso-osmotic PEG had a greater inhibitory effect than iso-osmotic NaCl, suggesting that osmotic stress was the main factor affecting halophytes seed germination. The inhibitory effects of NaCl and water stress mainly reflected in lowering seed germination rate, delaying initial germination time, and extending germination duration. Both of the halophytes had strong salt tolerance. When NaCl concentration was from 0 to 300 mmol·L-1, the relative germination rate of H. caspica was over 95%, and that of K. foliatum was over 80%, indicating that H. caspica was more salt-tolerant than K. foliatum. For H. caspica, its fit value of salt-tolerance was 332.5 mmol·L-1, critical value was 540 mmol·L-1, and the maximum value was 749 mmol·L-1, while for K. foliatum, the corresponding values were 246.5 mmol·L-1, 391.8 mmol·L-1 and 537 mmol·L-1 respectively. Low concentration NaCl solution promoted shoot growth. The two halophytes treated by 100 mmol·L-1 NaCl had the maximum length of root and shoot, and the shoot grew well.

Key words: Lathyrus sativus, EMS, 60Coy-ray(unit.Krad), ODAP(β-N-Oxalyl-α,β-diamino propionic acid)