【摘要】 为揭示红花玉蕊对淹水胁迫的生理响应机制,获得红花玉蕊适生的淹水时长范围,模拟半日潮,在温室分别以不同淹水时长对红花玉蕊幼苗进行完全淹没胁迫处理,测定了植株的生长指标及生理指标。结果表明:淡水全淹处理28 d后,红花玉蕊幼苗全部是绿叶株,存活率为100%。不同淹水时长对红花玉蕊幼苗株高、地径、叶片的总增长量和增长速率的影响差异不显著,不同淹水天数对幼苗株高地径、叶片的增长速率影响差异极显著。随着淹水时长的增加,幼苗叶片在淹水时长为0～6 h/d时超氧化物歧化酶活性呈平稳趋势,过氧化物酶活性和丙二醛含量先升高后下降,较CK差异均不显著,但脯氨酸含量则显著下降,在淹水4、6 h/d时较CK呈显著差异;淹水时长增加至8～12 h/d时,超氧化物歧化酶活性显著上升,在淹水10 h/d达到最大值且较CK呈极显著差异,脯氨酸含量在淹水10、12 h/d时较CK呈显著差异。可见,淡水全淹0～12 h/d并未影响红花玉蕊植株的生长发育进程,红花玉蕊幼苗在淡水全淹环境下淹水胁迫环境的临界时间为8 h/d,最小适生淹水时长为0～12 h/d。更多还原

【Abstract】 In order to reveal the physiological response mechanism of Barringtonia acutangula to flooding stress, the range of flooding duration of B. acutangula was obtained. Half-day tide was simulated. B. acutangula seedlings were completely submerged under different flooding time in the greenhouse, and the growth index and physiological indexes of the plants were determined. The results show that after 28 days of fresh water flooding treatment, the seedlings of B. acutangula were all green-leaved plants, and the survival rate is 100%. The effects of different flooding duration on plant height, ground diameter, total leaf growth and growth rate are not significant. The effects of different flooding days on plant height, ground diameter and leaf growth rate are extremely significant. With the increase of flooding time, the SOD activity of seedling leaves show a steady trend when the flooding time is 0-6 h/d. POD activity and MDA content increase at first and then decrease. The difference of POD activity and MDA content is not significant compared with CK, but proline content decreased significantly.The SOD activity increases significantly when the flooding time is increased to 8-12 h/d, and reaches the maximum at 10 h/d. The content of proline is significantly different from CK at 10 h/d and 12 h/d of flooding. It can be seen that fresh water flooding for 0-12 h/d do not affect the growth and development of B. acutangula stamen plants. The critical time of drowning stress for B. acutangulaseedlings is 8 h/d under full-flooded fresh water environment, and the minimum suitable time for drowning is 0-12 h/d.更多还原