Yıl: 2010 Cilt: 34 Sayı: 4 Sayfa Aralığı: 303 - 310 Metin Dili: İngilizce

Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress

Öz:
The effects of 2 nitrate levels, 14 (CK) and 140 mmol $L ^{1-}$ (T), on the leaf gas exchange variables of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated. Photosynthetic light- and $CO _{2-}$-response curves from CK and T seedlings were determined and used for the analysis of photosynthetic capacity. The results showed that nitrate stress resulted in a significant reduction of net photosynthesis of T seedlings compared with CK. At the same time, the apparent quantum yield, light-saturated net photosynthesis, carboxylation efficiency, and $CO _{2-}$- saturated net photosynthesis in nitrate-stressed cucumbers also decreased significantly with the increase of treatment time. At 12 days, the apparent quantum yield, light-saturated net photosynthesis, carboxylation efficiency, and $CO _{2-}$- saturated net photosynthesis in nitrate-stressed cucumbers were 47%, 60%, 64%, and 54% lower than CK, respectively. The relative effect of stomatal resistance on photosynthesis (S%) in nitrate-stressed cucumber seedlings increased significantly during the first 8 days and returned to the level of CK thereafter. This evidence indicates that not only stomatal but also nonstomatal limitations might be involved in the reduction of net photosynthetic rate in nitrate-stressed seedlings.
Anahtar Kelime: stress photosynthesis light intensity cucumbers selection responses carbon dioxide stress conditions seedlings leaves Turkey nitrate

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA YANG X, WANG X, WEI M (2010). Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress. Turkish Journal of Botany, 34(4), 303 - 310.
Chicago YANG Xiaoyu,WANG Xiufeng,WEI Min Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress. Turkish Journal of Botany 34, no.4 (2010): 303 - 310.
MLA YANG Xiaoyu,WANG Xiufeng,WEI Min Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress. Turkish Journal of Botany, vol.34, no.4, 2010, ss.303 - 310.
AMA YANG X,WANG X,WEI M Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress. Turkish Journal of Botany. 2010; 34(4): 303 - 310.
Vancouver YANG X,WANG X,WEI M Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress. Turkish Journal of Botany. 2010; 34(4): 303 - 310.
IEEE YANG X,WANG X,WEI M "Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress." Turkish Journal of Botany, 34, ss.303 - 310, 2010.
ISNAD YANG, Xiaoyu vd. "Response of photosynthesis in the leaves of cucumber seedlings to light intensity and $CO _{2-}$ concentration under nitrate stress". Turkish Journal of Botany 34/4 (2010), 303-310.