Funding for this research was provided by:
National Science Foundation (31501346, 31621005)
National Basic Research Program of China (973 Program) (2016TFD0101006)
Received: 12 October 2017
Accepted: 24 April 2018
First Online: 9 May 2018
: The <i>Gossypium hirsutum</i> acc. CCRI24 seeds used in this study were supplied by Dr. Xiongming Du (National Mid-term Genebank for Cotton, Institute of Cotton Research of CAAS). Plants were grown in the growth room for sample collection. The research conducted in this study required neither approval from an ethics committee, nor involved any human or animal subjects.
: All authors read and approved the final manuscript.
: The authors declare that they have no competing financial interests.
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