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不同脱水速率对“勐海大叶茶”种子脱水敏感性与抗氧化酶活性的影响
引用本文:陈志欣,包云秀,郑丽,兰芹英,谭运洪.不同脱水速率对“勐海大叶茶”种子脱水敏感性与抗氧化酶活性的影响[J].云南农业大学学报,2012,27(2):241-248.
作者姓名:陈志欣  包云秀  郑丽  兰芹英  谭运洪
作者单位:1 . 云南农业大学 园林园艺学院,云南 昆明 650201;2. 中国科学院 西双版纳热带植物园,云南 勐腊 666303;3. 云南省农业科学院 茶叶研究所,云南 勐海 666200
摘    要: 以大叶茶品种“勐海大叶茶”(Camellia sinensisvar. assamicacv. Menghai Dayecha)种子为材料,研究了脱水速率对种子的脱水敏感性与抗氧化酶活性的影响。快速脱水采用活化硅胶进行脱水处理,慢速脱水采用饱和氯化钠溶液进行脱水。结果表明:“勐海大叶茶”种子对脱水敏感,种子含水量高于44%时,慢速脱水条件下,种子的脱水耐性高于快速脱水;种子含水量低于38%时,快速脱水条件下,种子脱水耐性高于慢速脱水。脱水过程中种子细胞膜系统受到了伤害,相对电导率和TBARs含量均呈上升趋势,SOD的活性总体上呈上升的趋势;CAT呈下降的趋势;慢速脱水过程中,GR和DHAR活性被激发,在一定程度上减少了脱水伤害

关 键 词:“勐海大叶茶”种子  脱水速率  抗氧化酶  膜质过氧化  脱水敏感性

Effect of Different Drying Rates on the Desiccation Tolerance and Antioxidant Enzyme Activities of Camellia sinensis var. assamica cv. Menghai Dayecha Seeds
CHEN Zhi-xin,BAO Yun-xiu,ZHENG Li,LAN Qin-ying,TAN Yun-hong.Effect of Different Drying Rates on the Desiccation Tolerance and Antioxidant Enzyme Activities of Camellia sinensis var. assamica cv. Menghai Dayecha Seeds[J].Journal of Yunnan Agricultural University,2012,27(2):241-248.
Authors:CHEN Zhi-xin    BAO Yun-xiu  ZHENG Li  LAN Qin-ying  TAN Yun-hong
Affiliation:1.College of Landscape and Horticulture,Yunnan Agricultural University, Kunming 650201, China;
2.Xishuangbanna Tropical Botanical Garden, Mengla 666303, China;
3.Institute of Tea, Yunnan Agriculture Academy of Sciences, Menghai 666200, China
Abstract:The effects of different drying rates on desiccation tolerance and antioxidant enzyme activities of “Menghai Dayecha” (Camelli sinensis var. assamica cv. Menghai Dayecha) seeds were studied. Rapid dehydrated method was carried out by activated silica gel; slow dehydrated method was carried out by a saturated solution of sodium chloride. Results showed that: “Menghai Dayecha” seeds were sensitive to dehydration, while dehydration continued seed germination rates declined. When water content was higher than 44%, seeds of “Menghai Dayecha” showed higher tolerance at slow dehydrated method, though when water content was lower than 38%, seeds of “Menghai Dayecha” showed higher tolerance at rapid dehydrated method. Cell membrane cleavage occurred during dehydration, as a result of relative electrolyte leakage and TBARs content ascent. Superoxide dismutase (SOD) increased during dehydration; catalase (CAT) decreased with the declining water content; glutathione reductase (GR) and dehydroascorbate reductase (DHAR) activities were inspired at slow dehydrated method, which reducing the desiccation damage.
Keywords:&ldquo  Menghai Dayecha&rdquo  seeds  drying rate  antioxidant enzyme  lipid peroxidation  desiccation sensitivity
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