Journal
FRONTIERS IN PLANT SCIENCE
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2017.02217
Keywords
mitochondrial dysfunction; oxidative stress; tapetal programmed cell death; chemical hybridization agent; wheat
Categories
Funding
- National High Technology Research and Development Program of China [2011AA10A106]
- National Support Program of China [2015BAD27B01]
- National Natural Science Foundation of China [31171611, 31371697]
- Technological Innovation and Over Planning Projects of Shaanxi Province [2014KTZB02-01-02]
- Nature Science Foundation of Hubei Province [2016CFB478, 2017CFB234]
- Yangtze Fund for Youth Teams of Science and Technology Innovation [7011802111]
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Male sterility in plants has been strongly linked to mitochondrial dysfunction. Chemical hybridization agent (CHA)-induced male sterility is an important tool in crop heterosis. Therefore, it is important to better understand the relationship between mitochondria and CHA-induced male sterility in wheat. This study reports on the impairment of mitochondrial function duo to CHA-SQ-1, which occurs by decreasing cytochrome oxidase and adenosine triphosphate synthase protein levels and theirs activities, respiratory rate, and in turn results in the inhibition of the mitochondrial electron transport chain (ETC), excessive production of reactive oxygen species (ROS) and disruption of the alternative oxidase pathway. Subsequently, excessive ROS combined with MnSOD defects results in damage to the mitochondrial membrane, followed by ROS release into the cytoplasm. The microspores underwent severe oxidative stress during pollen development. Furthermore, chronic oxidative stress, together with the overexpression of type II metacaspase, triggered premature tapetal apoptosis, which resulted in pollen abortion. Accordingly, we propose a metabolic pathway for mitochondrial-mediated male sterility in wheat, which provides information on the molecular events underlying CHA-SQ-1-induced abortion of anthers and may serve as an additional guide to the practical application of hybrid breeding.
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