Role of the expansin genes NtEXPA1 and NtEXPA4 in the regulation of cell extension during tobacco leaf growth

Role of the expansin genes NtEXPA1 and NtEXPA4 in the regulation of cell extension during tobacco... The tobacco plant genes NtEXPA1 and NtEXPA4 encode the α-expansin proteins involved in the regulation of cell growth and extension. We examined the levels of expression of these genes in various plant organs and under the effect of exogenous phytohormones. The highest level of NtEXPA1 expression were registered in the terminal bud and in the young growing leaves and flowers. NtEXPA1 expression ceased once the leaves stopped growing. The NtEXPA4 gene showed a similar expression profile, except for higher levels of mRNA in the leaves. In young leaves located near the terminal bud, high levels of NtEXPA1 and NtEXPA4 are induced by auxins. In the lower leaves, expansin expression is differentially regulated by brassinosteroids, which inhibit NtEXPA1 and upregulate NtEXPA4. We further showed that expression of the transgenic ARGOS-LIKE protein results in upregulation of NtEXPA1 and a reduction in the NtEXPA4 mRNA. In turn, overexpression of NtEXPA1 resulted in an increased size of the leaves and stems because of the larger size of the individual cells. Russian Journal of Genetics Springer Journals

Role of the expansin genes NtEXPA1 and NtEXPA4 in the regulation of cell extension during tobacco leaf growth

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Pleiades Publishing
Copyright © 2014 by Pleiades Publishing, Inc.
Biomedicine; Human Genetics; Animal Genetics and Genomics; Microbial Genetics and Genomics
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