Growth and physiological responses of two mangrove species (Bruguiera gymnorrhiza and Kandelia candel) to waterlogging
Growth and physiological responses of two mangrove species (Bruguiera gymnorrhiza and Kandelia candel) to waterlogging
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DOI：
10.1016/s0098-8472(02)00071-0
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发表时间：
2003-06
影响因子：
5.7
通讯作者：
Y. Ye;N. Tam;Y. Wong;C. Lu
中科院分区：
文献类型：
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作者：
Y. Ye;N. Tam;Y. Wong;C. Lu
研究了淹水时间对木榄和秋茄两种红树林生长和生理响应的影响。B的相对生长速率。随着淹水时间的延长，木榄根的生长量显著下降，其中排水植物的生长量最高，淹水12周的最低。而淹水和排水条件下的钾含量差异不显著。坎德尔植物。K.在淹水8周和12周时，Candel增加，而B几乎没有变化。gymnorrhiza，表明K.而B则没有。裸根草这两种红树林不同的生长反应支持了K.秋茄比B更耐涝。裸根草淹水处理12周后，B处理的根系氧化酶活性显著降低。而K.坎德尔叶片叶绿素含量变化。Candel对淹水的反应比B更快。裸根草叶片中过氧化物酶和超氧化物歧化酶活性均显著升高。在淹水时间大于8周时，仅B.结果表明，木榄的生长量显著增加，说明K.秋茄对水涝造成的氧化伤害有较强的抵抗力。这些生理指标进一步支持了K.秋茄比B更耐涝。裸根草
Effects of duration of waterlogging on growth and physiological responses of two mangrove species, Bruguiera gymnorrhiza and Kandelia candel, were investigated. The relative growth rate of B. gymnorrhiza decreased significantly with waterlogged time, with the highest value found for drained plants and the lowest in plants under 12 weeks waterlogging. On the contrary, no significant difference was found between waterlogged and drained K. candel plants. The shoot to root biomass ratio of K. candel increased when subjected to 8 or 12 weeks waterlogging but little change was recorded in B. gymnorrhiza, indicating a shift in biomass allocation from roots to shoots in K. candel under prolonged waterlogging but not in B. gymnorrhiza. These different growth responses between the two mangrove species supported the hypothesis that K. candel is more tolerant to waterlogging than B. gymnorrhiza. Under 12 weeks waterlogged treatment, root oxidase activity significantly decreased in B. gymnorrhiza but increased in K. candel. Chlorophyll contents of K. candel increased more rapidly in response to waterlogging than B. gymnorrhiza. Activities of both peroxidase and superoxide dismutase increased significantly in leaves of K. candel when the waterlogging period was longer than 8 weeks, while only the peroxidase activity of B. gymnorrhiza showed a significant increase, indicating that K. candel had stronger resistance to the oxidant damage resulting from waterlogging. These physiological indicators further supported the hypothesis that K. candel is more tolerant to waterlogging than B. gymnorrhiza.