Response of photosynthesis in the leaves of cucumber seedlings to light intensity and CO2 concentration under nitrate stress

Xiaoyu YANG; Xiufeng WANG; Min WEI

Makale detayları

Response of photosynthesis in the leaves of cucumber seedlings to light intensity and CO2 concentration under nitrate stress

Yazarlar:

Xiaoyu YANG | Xiufeng WANG | Min WEI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Botany 2010 Vol.34 Issue 4, pp.303-310

Belge Tipi:

Makale

Yayın Tarihi:

3/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000723315

Sıklık:

İki Aylık

eISSN:

1303-6106

pISSN:

1300-008X

Özet:

 

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 CO2-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 CO2-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 CO2-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.

 

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 CO2-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 CO2-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 CO2-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.

Makale detayları

Response of photosynthesis in the leaves of cucumber seedlings to light intensity and CO2 concentration under nitrate stress

Yazarlar: Xiaoyu YANG | Xiufeng WANG | Min WEI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Botany 2010 Vol.34 Issue 4, pp.303-310

Belge Tipi: Makale

Yayın Tarihi: 3/2010

Belge Dili: Türkçe

Document ID (Org No.): 2000723315

Sıklık: İki Aylık

eISSN: 1303-6106

pISSN: 1300-008X

Sayı

Yazarlar:

Xiaoyu YANG | Xiufeng WANG | Min WEI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Botany 2010 Vol.34 Issue 4, pp.303-310

Belge Tipi:

Makale

Yayın Tarihi:

3/2010

Belge Dili:

Türkçe

Document ID (Org No.):

2000723315

Sıklık:

İki Aylık

eISSN:

1303-6106

pISSN:

1300-008X