Maturation of shoots, leaves and fruits of Ecolly grape in response to alternative new pruning system and harvesting times in China

摘要

This study investigated effect of two trellises, single crawled cordon training (SCCT) and independent long-stem pruning (ILSP) on change of total organic carbons (TOCs) in the shoots and leaves and microstructure of shoots in early October, as well as total soluble solid (TSS), total acid (TA) and maturity index (MI) of 'Ecolly' grape on July 21, 29 and August 24, respectively. The results proved that there was obvious difference from TOC between shoots and foliage of the two trellises. TOC level of shoots in the first, second, third and fourth, except for the fifth, from the root of the main stem labelled in ILSP was higher than those in SCCT, respectively. Level of blades followed the former. The maturity level in SCCT shoots and blades was superior to ILSP, despite total value, 3261.64 g/Kg, of TOC accumulated in ILSP shoots and leaves exceeded those, 2955.37 g/Kg, in SCCT, respectively, whcih could be observed through microstructure in various trellises of shoots. Additionally, identical TSS per shoot in SCCT was higher than that in ILSP during three consecutive seasons excluding the second and third shoots on August 24. Although SCCT revealed higher TSS than ILSP before August 9, and other results (concurrent 16.8% and 17.2%, respectively) between August 9 and 24, there were still no significant variety between trellises after August 24, MI was similar. Meanwhile, SCCT (4.54 g/L in 26 August and 3.82 g/L in 11 September) had higher TA than ILSP (4.23 g/L in 26 August and 3.62 g/L in 11 September) except before August 24. Therefore, SCCT could be proposed as a viable choice improving ripening process, quality of grape and maturation of shoots and leaves for China growers.