NaCl胁迫对嫁接番茄生长和光合特性的影响

Effects of NaCl Stress on Growth and Photosynthetic Characteristics in Grafted Tomato Seedlings

在NaC l胁迫下,对番茄嫁接苗和自根苗的生长和光合特性进行了比较。结果表明:NaC l胁迫能显著抑制自根苗和嫁接苗的生长,但嫁接苗受抑程度较轻;自根苗在NaC l胁迫前期(2 d和5 d),气孔因素是限制光合作用的主要因子,瞬间光合水分利用率显著提高,在胁迫后期(10 d),非气孔限制成为主导因子,瞬间光合水分利用率显著下降;嫁接苗在胁迫前期,光合作用受抑不明显,胁迫后期,气孔因素成为限制光合作用的因子,且整个胁迫期WUE变化不明显,表明嫁接苗有较强的耐盐性。

Comparison of plant growth and photosynthetic characteristics was made between grafted and own-root tomato （Lycopersicon esculentum Mill. ） seedlings under NaCl stress. The following results were obtained. Plant growth was significantly inhibited in own-root and grafted tomato seedlings, but the inhibiting effect in grafted plants was lower than that in own-root plants. At the early stage of stress （2 d and 5 d）, the inhibition of photosynthesis of own-root plants was mainly caused by the stomatal factor, while water use efficiency was elevated. At the late stage of stress （ 10 d）, non-stomatal limitation became the main factor. Photosynthesis of grafted plants was not inhibited significantly at the early stage of stress, the inhibition of photosynthesis was mainly caused by the stomatal factor at the late stage of stress, and no significant change of water use efficiency was observed during the whole stress period, which indicated that grafted plants possessed a stronger salt tolerance.