It appears you don't have support to open PDFs in this web browser. To view this file, Open with your PDF reader
Abstract
Background
In winter wheat (Triticum aestivum), delayed senescence of the flag leaf is linked to the duration of photosynthesis and grain yield. In different wheat cultivars, various components of the photosynthetic apparatus may display differences during senescence. Furthermore, previous studies related to senescence mostly used a limited number of cultivars, making it difficult to investigate the patterns and reasons for different appearance of damage to electron transport among various cultivars.To tackle these challenges, flag leaves of 32 wheat cultivars were subjected to darkness in vitro to simulate the senescence process. The cultivars were divided into three groups by k-means clustering, based on the rate of decline in their leaf chlorophyll content. Subsequently, we simultaneously measured prompt chlorophyll a fluorescence, delayed chlorophyll a fluorescence, and modulated 820-nm light reflection to examine the alterations in photosynthetic electron transport within the three groups of wheat cultivars during dark-induced senescence.
Results
The results showed that the photosystem II (PSII) donor side, grouping of PSII units, PSII reaction center, PSII acceptor side, and photosystem I (PSI) were all damaged during dark-induced senescence, while the sensitivity of photosynthetic electron transport to senescence gradually increased from the upstream to downstream electron carriers on the PSII acceptor side. The extent of the observed decrease in activity of the different components of the photosynthetic electron transport chain during senescence, was consistent with the chlorophyll degradation rate of the wheat cultivars, while the priority of inhibition for different photosynthetic electron transport processes in each cultivar group was different. The results from the three separate signals align well with each other.
Conclusions
The sensitivity of different part of photosynthetic electron transport to senescence were varied depended on their chlorophyll degradation rate. The differences in the response of different processes of photosynthetic electron transport to chlorophyll degradation rates might be an important factor influencing the differences in photoinhibition among wheat cultivars, especially in senescence process.
You have requested "on-the-fly" machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Show full disclaimer
Neither ProQuest nor its licensors make any representations or warranties with respect to the translations. The translations are automatically generated "AS IS" and "AS AVAILABLE" and are not retained in our systems. PROQUEST AND ITS LICENSORS SPECIFICALLY DISCLAIM ANY AND ALL EXPRESS OR IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES FOR AVAILABILITY, ACCURACY, TIMELINESS, COMPLETENESS, NON-INFRINGMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Your use of the translations is subject to all use restrictions contained in your Electronic Products License Agreement and by using the translation functionality you agree to forgo any and all claims against ProQuest or its licensors for your use of the translation functionality and any output derived there from. Hide full disclaimer