摘要
水培和沙培试验结果表明,20mmol/L和40mmol/LNaCl胁迫,不影响坪山柚种子萌发率,但萌发时间延长2～4d;60～100mmol/LNaCl胁迫,随NaCl浓度的增加,坪山柚种子萌发率、胚根及芽长度下降,种子相对盐害率升高,相对盐害率和芽长度可作为柚种子耐盐性的评价指标。40mmol/LNaCl胁迫对坪山柚幼苗生长的影响不大,80～200mmol/LNaCl胁迫,明显降低坪山柚幼苗株高、叶面积、地上部干重和根部干重。根冠比维持相对稳定,有利于提高耐盐性。坪山柚幼苗生长受抑制的主要原因是地上部及根部吸收了较多Na+和Cl-,从而产生离子毒害。
Effects of NaCl stress on seed germination and seedling growth of Citrus grandis Osbeck cv. Pingshanyou was studied by means of solution culture and sand culture.The results showed that 20 mmol/L and 40 mmol/L of sodium chloride(NaCl) had no effect on the seed germination percentage, but delayed 2～4 d to complete germination. Seed germination percentage, radicle length and sprout length of Pingshan pomelo decreased with the increase in the concentration of 60～100 mmol/L NaCl, but the relative injury rate increased. The relative injury rate and sprout length could be regarded as an important index for evaluating the salt tolerance of pomelo seed. 40 mmol/L NaCl had no effect on the seedling growth. Seedling plant height, leaf area, shoot dry weight, root dry weight decreased drastically under 80～200 mmol/L NaCl stress. The relatively stable ratio of root/shoot could help improve the salt tolerance.The main reason for inhibiting growth of Pingshan pomelo seedlings was ion toxicity of Na+ and Cl-,which were excessly absorbed by both the above ground parts and the root of Pingshan pomelo seedlings.
出处
《江西农业大学学报》
CAS
CSCD
2003年第5期693-697,共5页
Acta Agriculturae Universitatis Jiangxiensis
基金
福建省高校测试基金(JC99006)
关键词
柚
耐盐性
种子萌发
幼苗生长
离子毒害
Citrus grandis Osbeck cv. Pingshanyou
seed germination
seedling growth
salt tolerance
ion toxicity
