Saline-alkaline Stress on Photosynthesis， Chlorophyll a Fluorescence of Two Cultivars of Grape

doi:10.3969/j.issn.1000-7091.2012.z1.034

Abstract

Abstract: Soil salinization and alkalization is a worldwide problem limit productivity of horticultural crops．Many studies have focused on responses of crop to either salt or alkaline stress． However， seldom have studies focused on the effects of this mixed stress． In our experiment in Yinchuan， Northern China， the mixtures of three salts( NaCl， Na₂SO₄， Na₂CO₃ with proportion of 1 ∶ 0． 5 ∶ 0． 5) in various concentrations (0， 100， 200， 400 mmol /L) wereused to simulate a range of soil natural salt-alkaline conditions． Three-year-old seedlings of two grape cultivars，Crimson ( CRS) and Moldova ( MDW) ， widely spread in the world， were planted in open field conditions under thetreatments． The results indicate that light saline-alkaline treatments enhanced the photosynthetic capability in twogrape cultivars． For the high concentration， net photosynthetic rate ( Pn) and stomatal conductance ( Gs) of CRS orMDW increased． In Pn light response curves， the same tendency was observed． For CRS， the increase of Pn benefitedfrom high Gs and transpiration rate ( Tr) ， however， a low Fv /Fm decreased such impacts． For MDW， high Fv /Fmhelpfully maintain a relatively stable Pn． The two cultivars demonstrated different suitability regime to saline-alkalinestress．

Key words: Saline-alkaline stress, Photosynthesis, Chlorophyll a fluorescence, Photosynthetic light response curve, Grape cultivars

CLC Number:

S663.1

PENG Yu, XUE Da-yuan, LI Xi-meng, WANG Yan-jie, MA Shuai, FENG Jin-zhao. Saline-alkaline Stress on Photosynthesis， Chlorophyll a Fluorescence of Two Cultivars of Grape[J]. ACTA AGRICULTURAE BOREALI-SINICA, doi: 10.3969/j.issn.1000-7091.2012.z1.034.

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