Variation in glucosinolates in pak choi cultivars and various organs at different stages of vegetative growth during the harvest period

Abstract

Glucosinolates (GSs) play an important role in plant defense systems and human nutrition. We investigated the content and composition of GSs in the shoots and roots of seven cultivars of pak choi. We found that 'Si Yue Man' had the highest total and aliphatic GS contents in the shoots and the highest benzenic GS content in the roots, 'Shanghai Qing' contained the highest amounts of benzenic and total GS contents in the roots, while 'Nanjing Zhong Gan Bai' had the lowest benzenic, indole, and total GS contents in both the shoots and roots. Therefore, the 'Si Yue Man' cultivar appears to be a good candidate for future breeding. Variation between the shoots and roots was also examined, and a significant correlation among the total, aliphatic, and some individual GSs was found, which is of value in agricultural breeding. GS concentrations of the leaf, petiole, and root increased dramatically during the period of rapid growth of the dry matter of the plant 10 to 20 d after transplantation, reaching peak values on Day 20 and decreasing on Day 25. We conclude that the pak choi should be harvested and consumed from 20 to 25 d after transplantation to take advantages of the high GS content in the plant.

Expression profiles of glucosinolate biosynthetic genes in turnip (Brassica rapa var. rapa) at different developmental stages and effect of transformed flavin‐containing monooxygenase genes on hairy root glucosinolate content

“…c hinensis var. communis ) root . Most indole GSL levels increase during early ontogeny as they are important for the plant's protection from biotic stressors .…”

De novo Transcriptome Assembly of Chinese Kale and Global Expression Analysis of Genes Involved in Glucosinolate Metabolism in Multiple Tissues

“…It has been clinically proven that some glucosinolate-derived isothiocyanate and nitrile compounds display anticarcinogenic activity (Fahey and Talalay, 1999 ; Halkier and Gershenzon, 2006 ). To date, the variations in glucosinolate content and profile were observed in most of the brassica plants in different organs, cultivars, growth stages, and growing conditions (Xu et al, 2010 ; Yuan et al, 2010 ; Sun et al, 2011a , b , 2012 ; Lee et al, 2013 , 2014 ; Zhu et al, 2013 ; Bhandari et al, 2015 ; Yi et al, 2015 ). The contents and profile of glcosinolate in different tissues or organs of Chinese kale was previously reported (Sun et al, 2011a , b , 2012 ).…”

Ammonium/nitrate ratio affects the growth and glucosinolates content of pakchoi

“…The reasons for the differences between their results and ours may be due to variations in GSs contents among different plant parts, and/or genetic differences in GSs contents between species. In our previous study, we detected large differences in GSs contents among various organs of pakchoi (Zhu et al, 2013).…”