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首页> 外文期刊>Acta Physiologiae Plantarum >Summer pruning improves the branch growth and tea quality of tea trees (Camellia sinensis)
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Summer pruning improves the branch growth and tea quality of tea trees (Camellia sinensis)

机译：夏季修剪可改善茶树的枝条生长和茶叶品质

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摘要

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. Here the effects of summer pruning on 'Jin Guan Yin' oolong mature tea trees were studied. 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. 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). 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.
机译：目前，茶园通常采用一年两次的修剪，其中只采摘春茶。不同夏修剪时间和高度对茶树的影响尚不清楚。本文研究了夏季修剪对'金观音'乌龙成熟茶树的影响。结果表明，7月25日30 cm修剪（夏季修剪在春季修剪切面以上30 cm处）有利于侧枝的生长，而8月的2次修剪降低了侧枝的生长活力。在30厘米处修剪也可以通过降低茶多酚与游离氨基酸（TP / AA）的比例来提供好处，这是茶叶质量的重要因素。与常规夏季修剪相比，30 cm修剪和8月2次修剪均显著提高了酯儿茶素['（-）-表没食子儿茶素没食子酸酯（EGCG）+（-）-表儿茶素没食子酸酯（ECG）']的含量。8月15日修剪（8月15日夏季修剪20 cm）最低（EGCG+ECG）%。此外，在30 cm处修剪诱导的AA含量升高与谷氨酰胺合成酶（CsGS）或谷氨酰胺：2-氧代戊二酸氨基转移酶（CsGOGAT）转录增强显著相关。总之，7月25日30 cm夏修剪对侧枝生长和春茶产量品质的利害效果最好，8月15日修剪的综合效果最差。

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