夏季修剪可改善茶树的树枝生长和茶品质
第一作者
Liping Zhang
第一单位
农科院茶科所
通讯作者
Wenyan Han
Abstract
背景+问题:At present, twice-a-year pruning is usually adopted for the tea garden, in which only spring tea is picked. Effects of different times and heights of summer pruning on tea trees are unknown.
主要研究:Here the effects of summer pruning on 'Jin Guan Yin’ oolong mature tea trees were studied.
结果1:The results showed that pruning at 30 cm (summer pruning at 30 cm above the cut surface of spring pruning) on Jul 25 could benefit to the growth of lateral branches, whereas two pruning treatments in August reduced their growth vigor.
结果2:Pruning at 30 cm could also provide a benefit by decreasing the ratio of total tea polyphenols to free amino acids (TP/AA), an important factor in tea quality. Pruning at 30 cm and two pruning in August all significantly enhanced the contents of ester catechins ['(−)-epigallocatechin gallate (EGCG) + (−)-epicatechin gallate (ECG)’] as compared to conventional summer pruning. Pruning on Aug 15 (summer pruning at 20 cm on Aug 15) had the lowest (EGCG + ECG)%. In addition, enhanced AA content induced by pruning at 30 cm was significantly associated with enhanced transcription of glutamine synthetase (CsGS) or glutamine:2-oxoglutarate aminotransferase (CsGOGAT).
结论:In a word, the summer pruning at 30 cm on Jul 25 was best to benefit the growth of lateral branches and spring tea yield and quality, whereas pruning on Aug 15 had the worst comprehensive effects.
摘 要
目前,通常只采春季茶的茶园每年进行两次修剪。夏季修剪的不同时间和高度对茶树的影响尚不清楚。这里研究了夏季修剪对“金观音”乌龙茶树的影响。结果表明,7月25日在30厘米处修剪(夏季修剪在春季修剪的切面上方30厘米处)可能有利于侧枝的生长,而8月的两次修剪处理降低了它们的生长活力。在30厘米处修剪还可以通过降低茶多酚与游离氨基酸(TP / AA)的比例(茶质量的一个重要因素)来提供好处。与常规夏季修剪相比,在30厘米处修剪和在8月进行两次修剪均显着提高了酯类儿茶素的含量['(-)-表没食子儿茶素没食子酸酯(EGCG)+(-)-表儿茶素没食子酸酯(ECG)']。在8月15日修剪(8月15日在20厘米处夏季修剪)的比例最低(EGCG + ECG)%。此外,在30 cm处修剪引起的AA含量增加与谷氨酰胺合成酶(CsGS)或谷氨酰胺:2-氧代戊二酸氨基转移酶(CsGOGAT)的转录增强显着相关。简而言之,7月25日夏季修剪30厘米最有利于侧枝的生长和春季茶的产量和品质,而8月15日修剪的综合效果最差。
DOI: https://doi.org/10.1007/s11738-021-03226-0
Journal: Acta Physiol Plant
Impact Factor:1.76
Published date: 25 March 2021
END
科学技术史上的今天
1845年3月27号,德国实验物理学家伦琴出生。伦琴一生在物理学许多领域中进行实验研究工作。1901年伦琴因发现 X射线而成为第一位获得诺贝尔物理学奖的科学家。
1963年3月27日,世界上第一位进入太空的人、前苏联宇航员尤里·加加林与飞行员谢列金在进行飞行训练时,失事遇难。
1980年3月27日,沉睡了120年的美国圣海伦斯火山爆发,巨大瓦斯云团升起达4000米高。
1987年3月27日,美国华裔科学家发现在氧化物超导材料中有转变温度为240K的超导迹象;很快日本鹿儿岛大学工学部发现由镧、锶、铜、氧组成的陶瓷材料在14℃温度下存在超导迹象。
Where there is a will, there is a way!