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Influence of Freezing Injury on Germination and Physiological-Biochemical Changes in Different Grain Types of Maize Seed

Author: NanMing
Tutor: WangHanNing
School: Gansu Agricultural University
Course: Crop Genetics and Breeding
Keywords: Corn seed Low-temperature damage Grain shape Germination Physiological and biochemical indexes Frost resistance
CLC: S513
Type: Master's thesis
Year: 2010
Downloads: 151
Quote: 0
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Abstract

Corn seed production of the basic agricultural production, the safe production of corn seeds directly affect their quality level, thereby affecting agricultural production and food security, and related to the vital interests of farmers and the practical interests. Low-temperature damage to key environmental factors that affect North seed production bases in China corn seed production safety maize seed harvest and during storage vulnerable to low-temperature damage occurred in the province Hexi Corridor corn seed production bases, resulting in a certain economic losses. In this paper, the freshly harvested grain corn hybrid seeds kulak No. 1 (Durum-type), Zheng 958 (intermediate), Liaodan 565 (Dent) study measured of different grain corn seed germination rate , germination potential, germination index, conductivity, soluble sugar content, superoxide dismutase, peroxidase, amylase activity. System analysis of several indicators with different grain corn seed frost resistance changes in the relationship. The study results show that: the different grain corn seed germination rate decreases with decreasing temperature Flint seeds relative to the other two tablets type high germination rate in the low-temperature damage; different grain corn seed cold extent of its water content, frost damage temperature and time, has a significant effect on the germination rate, germination potential and germination index; the three grain type germination rate around -10 ℃; When the grain moisture content of more than 15% -20% when low temperatures of -10 ° C or below processing the seed germination rate decreased; When seed moisture content below 15% -20%, -10 ℃ low temperature treatment does not affect the germination rate and germination potential, when the temperature is below -25 ° C. when three tablets germination rate, germination potential and germination index decreased significantly. Low-temperature damage the membrane pores larger lot of leakage of intracellular ion conductivity increases. Conductivity of low-temperature and low-temperature duration, the lower the temperature, the longer temperature treatment, the more serious damage to the cell membrane system, and conductivity of the greater; grain moisture content of 15-20%, -10 ℃ low temperature treatment before and after the conductance rate changes significantly; least kulak No.1 plasma membrane injury, Flint has a certain resilience seeds to low temperature, frost ability; Liaodan 565 seriously affected by low temperature and poor, dent seed resist the cold. Low-temperature damage caused by different grain corn seed internal protective enzyme system imbalance, so the corn seed SOD and POD activity increased. Granulocyte activity of low-temperature damage resistance than cold intolerance granulocyte activity changes significantly; enzyme activity and duration of the low-temperature and low-temperature, single and multiple factors interaction on the enzyme activity was extremely significant; Flint seeds POD activity and SOD activity when compared with the other two grain type, resistance to low temperature and freezing ability. By low temperature processing, three kinds of grain corn seed soluble sugar content of different magnitudes improve consistent trend. By frost damage temperature and time and moisture content affect different grain seed soluble sugar content; higher soluble sugar content, the stronger corn seed resistance to low temperature and freezing capacity. The three grain type corn seed frost resistance strength of kulak No. 1 flint gt; Zhengdan 958 (intermediate type) gt (horse toothed; Liaodan 565). Low-temperature damage, seed amylase activity increased starch accumulation in decline. Low-temperature and low-temperature duration of amylase activity significantly.

Influence of Freezing Injury on Germination and Physiological-Biochemical Changes in Different Grain Types of Maize Seed

Abstract

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