SH1-dependent maize seed development and starch synthesis via modulating carbohydrate flow and osmotic potential balance.

ABSTRACT:

Background

As the main form of photoassimilates transported from vegetative tissues to the reproductive organs, sucrose and its degradation products are crucial for cell fate determination and development of maize kernels. Despite the relevance of sucrose synthase SH1 (shrunken 1)-mediated release of hexoses for kernel development, the underlying physiological and molecular mechanisms are not yet well understood in maize (Zea mays).

Results

Here, we identified a new allelic mutant of SH1 generated by EMS mutagenesis, designated as sh1*. The mutation of SH1 caused more than 90% loss of sucrose synthase activity in sh1* endosperm, which resulted in a significant reduction in starch contents while a dramatic increase in soluble sugars. As a result, an extremely high osmolality

SUBMITTER: Zhang K 

PROVIDER: S-EPMC7282075 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature