花生种皮变化对种子抗破损力的影响

Influence of Peanut Testa Variation on Resistance of Seed to Breakage

通过研究花生干燥和存储过程中种子含水量、种皮超显微结构和果胶质含量,分析种皮结构变化对种子抗破损力的影响及其对种胚的保护机理。结果表明,在种子的晾晒和存储过程中,含水量由30%快速降至9%,种皮原果胶质不断转化为水溶性果胶质,种皮细胞逐渐衰老,细胞壁分离破碎,种皮结构不断空洞化和断裂。这些变化可能严重影响了种皮的机械强度和保护作用,并使得花生种子对破损力的抗性持续降低,机械脱壳的种子破碎概率增加。

In order to analyze the influence of testa structure change on seed resistance to breakage and the protection mechanism for seed embryo,water content of peanut seed,pectin content and cell structure of peanut testa were detected respectively.Results showed that the seed moisture reduced from 30% to 9% during 10 days of drying.During the drying and long term of peanut storage,protopectin were converted to pectin substances by hydrolysis in peanut testa.Then epidermis cells were gradually aging and died,and the cell walls were broken subsequently.These changes resulted in testa structure rupturing and hollowing out,and seriously affected the mechanical strength and protection function of peanut testa.Finally,the reducing of anti-breakage force increased the broken probability of peanut seeds during mechanical shelling process.