Effect of Chilling Stress under Weak Light on Photosynthetic Rate and Chlorophyll Fluorescence Parameters in Two Zucchini Seedling

doi:10.7668/hbnxb.2009.02.029

Abstract

Abstract: The effects of chilling stress (12℃) combined with weak light (140μmol/ (m²·s) )were investigated on net photosynthetic rate (Pn) and chlorophyll fluorescence parameters in leaves of two Zucchini seedlings,YAGUAR and X6-4.The results showed that the Pn of the two Zucchini varieties was decreased significantly after chilling and weak light stress,with YAGUAR′s Pn decreasing to a less extent than X6- 4′s.At the same time,maximal photosynthetic efficiency(Fv/ Fm),practical photosynthetic efficiency (Yield),photochemical quenching (qP) and non photochemical quenching(qN)were all declined to a greater extent in leaves of X6 - 4 than that of YAGUAR after treatment.Almost all the determined indices could restore completely to the level of control in YAGUAR after they came back to controled condition for 12 d,while they couldn′t in X6-4.The results indicated that 12 ℃ of low temperatrue combined with 140μmol/ (m²·s) low illumination caused less harmful to photosynthetic center of PS Ⅱin leaves of YAGUAR than in those of X6-4.

Key words: Zucchini, Chilling under weak light, Net photosynthetic rate , Cholorophyll fluorescence

CLC Number:

S642.6

LIU Shuan-tao, DONG Yan-min, LU Ya-nan, LU Jin-dong, HE Qi-wei. Effect of Chilling Stress under Weak Light on Photosynthetic Rate and Chlorophyll Fluorescence Parameters in Two Zucchini Seedling[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(2): 139-143. doi: 10.7668/hbnxb.2009.02.029.

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