Evaluations of growth and cold resistance of Kandelia obovata seedlings in different hypocotyl harvesting periods
XIN Wenzhen
LIU Xing
YANG Sheng
MA Zengling
LIU Yu
LI Changda
WU Juanjia
CHEN Qiuxia
Abstract：To establish quality standards for quality hypocotyl of Kandelia obovata Longgang,a good cold-resistant mangrove variety appropriate for Zhejiang Province,the hypocotyl(LG1-5)of'K.obova-ta Longgang was collected at different stages with their fresh weight,length,cross diameter,and starch,crude protein and crude fat contents measured.The changes in seedling height,basal diameter and biomass of outdoor beach-grown seedlings were monitored.An indoor low temperature(-5.5 ℃)stress test was conducted to document the freezing damage and survival rate of its seedlings.The re-sults showed that the hypocotyl changed from long and thin to short and fat as the harvesting period was delayed.The principal component analysis showed that LG4 hypocotyl scored the highest,which was followed by LG1 and LG3.Correlation analysis further showed that there was a positive correlation(P＜0.05)among hypocotyl morphology,storage material and seedling growth with fresh weight and starch as the key factors.The cold resistance of LG1 was stronger than LG4 and LG2.The heavier the fresh weight,the higher the starch content,the better the growth potential of LG radicle.The earlier harvested hypocotyl had a certain amount of energy accumulation and sufficient growth time,and the seedlings were more resistant to cold.For the ecological restoration of Zhejiang mangroves,we recom-mend to harvest Longgang hypocotyl around April 10 and during the concentrated maturation period(mid to early May).
Keywords：mangrove plantKandelia obovataharvesting periodcold resistance
Publication Date：2026-02-25
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：10( 142-151 )