摘要
将菊花幼苗进行不同程度的高温胁迫处理,动态测定叶片光合能力(Pm)并记录叶片受伤害程度;在胁迫处理后每隔一天取出5株进行恢复生长,记录株高与节数增加值,测定各恢复阶段的光合速率(Pn)与暗适应下的初始荧光效率(Fo)、最大光化效率(Fv/Fm)的动态变化。结果表明,高温造成上位新生叶无法展开,中、下位叶出现黄斑、叶片反卷、下垂、干枯等受害症状,叶片的最大光合能力(Pm)明显下降,CO2补偿点升高。高温胁迫解除后,遭受低强度胁迫的植株可较快恢复生长,恢复40 d后的高生长及节数与对照无明显差异;高强度胁迫导致Fo持续升高,Pn与Fv/Fm则大幅度降低,菊花幼苗出现不可逆伤害,最终在恢复过程中死亡。
Chrysanthemum were treated under different high temperature conditions, the photosynthetic capaci- ty（Pro） was dynamically measured, and at same time the heat damages of leaves were recorded; 5 plants were respectively moved to normal condition for the growth recovery every other day. In the restoration process, abso- lute high added value and increasing of leafsegrnen number were recorded, combining with the dynamic variation of greatest net photosynthetic rate（ P. ）and the initial fluorescence （Fo） and the intrinsic photochemical efficiency （ Fv/Fm）. The results showed that, high temperature caused many obvious injury symptoms ： new leaf couldn＇t t spread normally; Irregular yellow spots appeared on middle and underneath leaves; lower leaves prolapsed and - dried. The heat stress induced obviously decrease of leaf maxis photosynthesis （Pm ） and rise of CO2 compen- satory point. After the termination of stress, the plants treated under low intensity stress can restored rapidly, displayed no obvious difference in high growth, leafsegmen number and Pn, Fo, Fv/Fm, contrasted with c 40 days later; oppositely, high intensity stress leaded to continuous rising of Fo and substantial declining and Fv/Fm, the plants died eventually in the restoration process because of the irreversible damage. ontrol of P.
出处
《山东农业大学学报（自然科学版）》
CSCD
北大核心
2013年第1期6-11,共6页
Journal of Shandong Agricultural University：Natural Science Edition
基金
山东农业大学青年科技创新基金
关键词
菊花
高温胁迫
生长恢复
Chrysanthemum
high temperature stress
vegetative recovery
