Comparative studies on salt tolerance of seedlings for one cultivar of puccinellia (Puccinellia ciliata) and two cultivars of tall wheatgrass (Thinopyrum ponticum)
Comparative studies on salt tolerance of seedlings for one cultivar of puccinellia (Puccinellia ciliata) and two cultivars of tall wheatgrass (Thinopyrum ponticum)
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DOI：
10.1071/ea03156
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发表时间：
2005-06
影响因子：
1.4
通讯作者：
B. Zhang;B. Jacobs;M. O’Donnell;J. Guo
中科院分区：
文献类型：
--
作者：
B. Zhang;B. Jacobs;M. O’Donnell;J. Guo
对梅内门（Puccinellia ciliata Bor）、泰瑞尔（Tyrrell）和邓达斯（Dundas）[高冰草（tall wheat grass）、蓬偃麦草（Thinopyrum ponticum（Podp.）Z. W. Liu和R. R. C.在盐胁迫条件下，比较了3个品种的种子萌发、对盐和渍害的适应性反应、出苗、植株生长、地上部渗透压和矿质元素含量。种子萌发时间呈反正态分布。在NaCl胁迫下，梅内门、泰瑞尔和邓达斯的种子发芽率分别在178.8、300.9和296.8 mmol/L NaCl中达到对照（蒸馏水）的50%。在92.7、107.2和113.5mmol/LNaCl处理下，3个品种的出苗率分别为对照的50%。在相同盐水平下，盐和淹水胁迫下3个品种的种子发芽率均远低于盐胁迫下的发芽率。NaCl溶液浸种预处理显著提高了梅内门和邓达斯种子在盐胁迫和淹水胁迫下的发芽率。Tyrrell和邓达斯对盐胁迫的耐受性非常相似，在种子萌发和出苗率方面，Tyrrell和Dundas的耐受性显著（P<0.05）高于梅内门。3个品种的苗高和干物质积累量在不同盐胁迫水平下均无显著差异，表明3个品种的成苗具有较强的耐盐性。这3个品种的耐盐机制可能与其在盐胁迫下通过调节高钠、高钾含量来维持地上部高渗透压和缓解钙缺乏有关。
Salt tolerances of 3 cultivars, Menemen puccinellia (Puccinellia ciliata Bor), Tyrrell and Dundas [tall wheatgrass, Thinopyrum ponticum (Podp.) Z. W. Liu and R. R. C. Wang], were compared with respect to their seed germination, adaptive responses to salt and waterlogging, seedling emergence, plant growth, shoot osmolality and mineral contents in a series of salt-stress experiments. An inverse normal distribution provided good fits for the time to seed germination. Under NaCl stress, 50% of the control (distilled water) seed germination rates of Menemen, Tyrrell and Dundas were achieved in 178.8, 300.9 and 296.8 mmol/L NaCl, respectively. Fifty percent of the control seedling emergence rates of these 3 cultivars were in 92.7, 107.2 and 113.5 mmol/L NaCl, respectively. The seed germination rates of these 3 cultivars under both salt and waterlogging stress were far lower than those germinated only under salt stress at the same salt level. Seed pretreatment by soaking seed in NaCl solutions greatly increased the seed germination rate under salt stress for Menemen and under both salt stress and waterlogging for Dundas. Tyrrell and Dundas were very similar in their tolerance to salt stress, and were significantly (P<0.05) more salt tolerant than Menemen in terms of seed germination and seedling emergence rate. Both shoot height and dry matter of these 3 cultivars were not statistically different among all salt stress levels during the seedling elongation period, indicating that the established plants of these 3 cultivars were very salt tolerant. The salt tolerance mechanisms of these 3 cultivars are possibly related to their abilities to maintain high osmolality in shoots by regulating high sodium and potassium contents, and reducing calcium deficiency under salt stress.