Beijing Academy of Forestry and Pomology Sciences, Beijing Academy of Agriculture and Forestry Sciences, National R&D Center for Fruit Processing, Beijing, China.
NSW Department of Primary Industries, Ourimbah, NSW, Australia.
J Sci Food Agric. 2021 Apr;101(6):2525-2533. doi: 10.1002/jsfa.10879. Epub 2020 Oct 30.
A common lenticel disorder which occurs in the peel of 'Xinli No. 7' pears (Pyrus bretschneideri Rehd.) had not previously been described. Symptoms of this lenticel disorder include enlarging and bulging of the lenticels which results in significant commercial losses. Understanding the physiological basis of lenticel disorder and developing practical methods to control it is crucial for the successful marketing of this pear.
The development of this lenticel disorder was found to be closely related to the endogenous ethylene production during storage. 1-Methylcyclopropene (1-MCP) combined with an ethylene absorbent (EA) treatment was found to significantly reduce the development of the disorder by inhibiting the expression of ethylene related genes, PbACS1, PbACS2 and PbACO. It is proposed that the enlarged lenticels may result from increased lignin accumulation in the peel cells, which is inhibited by this combined postharvest treatment. It was shown that the expression of six lignin related genes decreased following the treatment. The results suggest that PbPAL, Pb4CL and PbCAD could be critical in regulating the development of this lenticel disorder.
Endogenous ethylene plays a key role in the development of this lenticel disorder in 'Xinli No. 7' pear. The enlarged lenticels which is characteristic of this disorder maybe related to increased lignin accumulation in the peel cells, which were inhibited with 1-MCP combined with an EA treatment. These results provide a practical method for managing the development of lenticel disorder in 'Xinli No. 7' pear and helps clarify the developmental mechanisms of this disorder. © 2020 Society of Chemical Industry.
“新梨 7 号”梨（白梨）果皮上一种常见的皮孔病以前尚未被描述。这种皮孔病的症状包括皮孔增大和膨出，导致严重的商业损失。了解皮孔病的生理基础并开发实用的控制方法对于这种梨的成功营销至关重要。
发现这种皮孔病的发展与贮藏过程中内源乙烯的产生密切相关。1-甲基环丙烯（1-MCP）与乙烯吸收剂（EA）联合处理可通过抑制乙烯相关基因 PbACS1、PbACS2 和 PbACO 的表达，显著减少该病症的发生。据推测，增大的皮孔可能是由于果皮细胞中木质素积累增加所致，而这种联合采后处理抑制了木质素的积累。结果表明，六种木质素相关基因的表达在处理后降低。结果表明，PbPAL、Pb4CL 和 PbCAD 可能在调控这种皮孔病的发生中起关键作用。
内源乙烯在“新梨 7 号”梨皮孔病的发生发展中起关键作用。该病症特征性的增大皮孔可能与果皮细胞中木质素积累增加有关，1-MCP 与 EA 联合处理可抑制木质素的积累。这些结果为管理“新梨 7 号”梨皮孔病的发生提供了一种实用的方法，并有助于阐明该病症的发育机制。© 2020 英国化学学会。
