Physiological responses of five landscape and shelterbelts species to root waterlogging stress
Five tree species seedlings such as Pterocarya stenoptera(PS),Metasequoia glyptostroboides(MG),Taxodium mucronatum×T.distichum'Zhongshanshan'601(TA),Salix chaenomeloides(SC),and Salix jiangsuensis J-172(SJ)were waterlogged at 5 cm(shallow waterlogging)and 10 cm(deep waterlogging)in the field.The effects of waterlogging on photosynthetic traits,hormones,and antioxidants on these tree seedlings were investigated and their waterlogging tolerance was evaluated.The results showed that the contents of chlorophyll,gibberellin(GA),and abscisic acid(ABA)increased in SJ seedlings under waterlogging condition,and the leaves became smaller and greener than those of the control.SJ showed strong adaptability to waterlogging stress.MG seedlings had higher levels of[(Chla+Chlb)/Car],ZR/IAA,SOD,CAT,and proline under deep waterlogging treatment than those under shallow waterlogging treatment;therefore,MG seedlings are more suitable for deep flooding condition.Waterlogging decreased the levels of chlorophyll and SOD activity,increased H2 O2,and made the leaf yellower in PS seedlings.However,PS seedlings alleviated oxidative stress by increasing the levels of Car,NPQ,proline,and ABA and grew better in shallow waterlogging than in deep waterlogging treatment.The levels of height increment,pigment,qP,and IAA or ZR in SC seedlings were all higher in shallow waterlogging than those in deep waterlogging or CK treatment.SC can grow under shallow waterlogging conditions;however,deep waterlogging is unfavorable to its growth.Under waterlogging condition,the levels of chlorophyll,CAT,and ABA in TA seedlings decreased significantly,whereas MDA and REC increased the most in the five tree species.This indicate that TA seedlings were subjected to the highest oxidation stress compared to other tree species;however,TA seedlings could still grow under waterlogging conditions.Comprehensive assessment showed that the order of waterlogging-tolerance of the five tree species under shallow waterlogging was:PS>SC>SJ>MG>TA and the order under deep waterlogging was SJ>MG>PS>SC>TA.In summary,the five tree species showed strong adaptability to waterlogging stress and are suitable for landscape protection of forest species.This study provides important reference for the screening of landscape protection of forest along the Yangtze River.
万方数据
维普
