PJB-2018-1513
Seed reserve utilization and hydrolytic enzyme activities in germinating seeds of sweet corn
Xinxin Cheng, Feng Xiong, Changjin Wang, Hong Xie, Song He, Guanghan Geng and Yi Zhou
Abstract
In this study, two sh2 sweet corn cultivars (i.e., the initial seed dry weight for FT018 and TB010 was 0.16±0.02 g/grain and 0.09±0.01 g/grain, respectively) were used to determine the physiological characteristics of seed reserve utilization in germination. The data implied that the weight of mobilized seed reserve (WMSR) and seed reserve utilization efficiency (SRUE) increased with seed germination. FT018 exhibited higher SRUE than TB010 due to its sufficient energy production for growth. Sugar (sucrose and fructose) contents were at different levels in the germinating seed of sh2 sweet corn. The protein content and number of protein species were highest in the early stage of germination. Enzyme activity in the germinating seed indicated that enzymes for starch and sugar hydrolysis were important and that enzyme activities significantly differed at each germination stage and between the cultivars under dark conditions. Succinate dehydrogenase, sucrose synthase, and glucose-6-phosphate dehydrogenase accumulated in the late germination stage. Thus, appropriate efforts should be focused on improving the seed reserve utilization in sweet corn by identifying the physiological mechanism of germinating seed.
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