Effects of Heat Stress after Anthesis on PSII Photochemical Efficiency and the Antioxidant Activity of Wheat Cultivars

Mahroo Mojtabaie ZMANI; Majid NABIPOUR; Mousa MESKARBASHEE

doi:https://doi.org/10.15832/ankutbd.446391

Makale detayları

Effects of Heat Stress after Anthesis on PSII Photochemical Efficiency and the Antioxidant Activity of Wheat Cultivars

Yazarlar:

Mahroo Mojtabaie ZMANI | Majid NABIPOUR | Mousa MESKARBASHEE

Yayıncı:

Ankara University

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Journal of Agricultural Sciences 2018 Vol.24 Issue 1, pp.72-81

Belge Tipi:

Makale

Yayın Tarihi:

3/2018

Belge Dili:

İngilizce

Document ID (Org No.):

2000607669

Sıklık:

Üç Aylık

eISSN:

2148-9297

DOI:

https://doi.org/10.15832/ankutbd.446391

Özet:

 


This study was conducted to investigate the effects of heat stress after anthesis on the performance of Photosystem II (PSII) and the enzymatic activity of catalase and ascorbate peroxidase. Two treatments-normal and heat stress-were conducted on four bread wheat cultivars from 7 days after anthesis until maturity. Heat stress led to an acceleration of chlorosis, reduced the efficiency of electron transfer and increased concentrations of malondialdehyde; however, the level of susceptibility varied depending on the cultivars. On the 10th day of heat stress, reductions in fluorescence parameters, depending on the cultivar, were 6.9 to 18.9% for Fv/Fm, 9 to 21% for ΦPSII and 8.3 to 19.4% for F’v/F’m compared to normal conditions. Catalase activity increased after initial exposure to heat stress. However, after 10 days of treatment, catalase activity increased in the Chamran and Aflak cultivars by 32% and 45%, respectively, but it did not change in the Dez cultivar and decreased 22% in Darab2. Ascorbate peroxidase activity decreased in two treatments, while the amount of reduction in heat stress treatment was more than the normal treatment. The highest levels of enzymatic activity were observed in Chamran under heat stress conditions, whereas Darab2 and Dez showed the lowest activity of the enzymes. Chlorophyll fluorescence parameters and chlorophyll index had a significant negative correlation with the levels of malondialdehyde; however, they had a significant positive correlation with the antioxidant activity. 



.

Makale detayları

Effects of Heat Stress after Anthesis on PSII Photochemical Efficiency and the Antioxidant Activity of Wheat Cultivars

Yazarlar: Mahroo Mojtabaie ZMANI | Majid NABIPOUR | Mousa MESKARBASHEE

Yayıncı: Ankara University

Ana Başlıklar: Uygulamalı fizik

Dergi: Journal of Agricultural Sciences 2018 Vol.24 Issue 1, pp.72-81

Belge Tipi: Makale

Yayın Tarihi: 3/2018

Belge Dili: İngilizce

Document ID (Org No.): 2000607669

Sıklık: Üç Aylık

eISSN: 2148-9297

DOI: https://doi.org/10.15832/ankutbd.446391

Sayı

Yazarlar:

Mahroo Mojtabaie ZMANI | Majid NABIPOUR | Mousa MESKARBASHEE

Yayıncı:

Ankara University

Ana Başlıklar:

Uygulamalı fizik

Dergi:

Journal of Agricultural Sciences 2018 Vol.24 Issue 1, pp.72-81

Belge Tipi:

Makale

Yayın Tarihi:

3/2018

Belge Dili:

İngilizce

Document ID (Org No.):

2000607669

Sıklık:

Üç Aylık

eISSN:

2148-9297

DOI:

https://doi.org/10.15832/ankutbd.446391