DNA methylation map in cotton flower medicine at high temperature and room temperature.

Scientists have made new advances in studying the mechanisms of high temperature strains that cause male infertility and creating high-temperature-resistant species.
recently, the cotton team from Huazhong Agricultural University for the first time to map DNA methylation in cotton flower medicine at high temperature and room temperature, and for the first time found that the high temperature under pressure caused by pollen infertility and flower drug wall open fissure phenotype by different pathways. "We found significant changes in DNA methylation in male medicines at high temperatures, but we still don't have a deep understanding of what causes the changes in methylation and why this change causes male infertility, "
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" on June 11, Zhang Xianlong, a professor at the School of Plant Science and Technology at Huazhong Agricultural University, told Science and Technology Daily that their research provides a new way for high temperature-resistant breeding of crops, and that they hope to produce high-temperature-resistant species in the future.
high temperatures are now causing pollen male infertility" global warming leading to frequent occurrence of extreme high temperatures.
" Huazhong Agricultural University, the School of Plant Science and Technology Associate Professor Yu Ling told science and technology daily reporters, summer hot weather more frequent, crops are more vulnerable to high temperature injury, resulting in male infertility, usually in the flowers can not crack to release pollen, or flowers can not produce vibrant pollen.
" flower medicine is the production of pollen organs, it is the top of the flower silk puffed in the cystic part, is an important part of the male.
" Yu Ling said that if there is no pollen, or pollen is not active, the crop will not be strong, which has a very serious impact on crop yields.
Zhang Xianlong said that in the past, due to the one-sided pursuit of production, the seed resources that are cultivated tend to be less resistant, in the context of global warming, production has been greatly reduced. "If current climate change trends continue and global average temperatures increase, the production of major crops such as rice, corn and cotton will be severely affected and the damage will be severe,"
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" Zhang said, high temperatures have the most significant effect on crops in flowering, resulting in an increased chance of pollen infertility, thereby significantly reducing yields, of which cotton is very affected.
" Xinjiang is China's main cotton-producing region, high temperature son-in-law compared with normal years, there are an average of about 20% of production reduction, serious areas, such as southern Xinjiang, production reduction of up to about 50%.
and high temperature will also affect the quality of cotton fiber, resulting in the overall decline of cotton grade, transaction price will also be reduced.
," Zhang said.
high-temperature seed to deal with global warming in order to lead to plant "infertility" the culprit, the researchers early through group screening, identified to high temperature and high temperature sensitive materials each 20 parts, one of which is high temperature-resistant "84021", one is not resistant to high temperature "H05", is the Cotton Team of Central China Agricultural University two applications of more breeding.
" through identification found that the two cotton materials in high temperature there are significant fertility differences.
," Yu Ling told reporters.
they found through transcription group sequencing that the number of different expression genes of high-temperature materials far exceeded the number of high-temperature-resistant materials, "we assumed at the time that there were differences in apparent modification," Yu ling said.
they further analyzed and found that high temperatures increased the expression of type I casein kinase in high-temperature-resistant materials in the velvet layer and small spores, which directly affected the balance between sugar and hormone signals in the flower medicine, leading to infertility. "However, the mechanism by which DNA methylation is involved in the high temperature response to the male reproductive organs of plants remains unclear,"
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," said Yu Ling. in
to simulate the relationship between CHANGEs in DNA methylation and the breeding of flower medicine under high temperature conditions, the researchers constructed a map of DNA methylation differences in the development period of the tetracydistic period, the degradation period of the velvet felt layer and the development of three important flower medicines in the period of flower medicine cracking.
" results showed that at high temperatures, inability to withstand high temperatures showed relatively low levels of DNA methylation, while high-temperature resistant materials remained at high levels.
" Said ingenuity said that through the application of DNA methylation inhibitors, the high-temperature material at room temperature similar to high temperature conditions of pollen infertility phenotypes, but at the same time the flower wall is normal cracking. "It's an interesting phenomenon, "
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" Zhang said, they found that sugar and reactive oxygen metabolic pathways were significantly regulated by DNA methylation, while the growth hormone pathways did not change significantly under inhibitor serombling, suggesting that high temperature conditions were regulated by the transcription of growth-related microRNAs.
" after figuring out the reasons why flower medicine does not crack and pollen is not active, we can select high-temperature crop varieties through hybridization and other means.
" Zhang Xianlong told reporters that this is a global warming environment in the context of crop production has a positive significance.
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