以辐热积(每日温度相对热效应×光合有效辐射,Phototherm al product,PTP)为光温指标,通过不同扦插期的试验研究了温度和辐射与‘千禧’一品红发育和品质指标的定量关系,明确了从短日至单苞期、单蕾期、多蕾期、开花期所需要的PTP...以辐热积(每日温度相对热效应×光合有效辐射,Phototherm al product,PTP)为光温指标,通过不同扦插期的试验研究了温度和辐射与‘千禧’一品红发育和品质指标的定量关系,明确了从短日至单苞期、单蕾期、多蕾期、开花期所需要的PTP。结果表明标准化株高净增量(株高净增量/扦插苗初始叶面积)与PTP呈幂函数关系;主干叶片净增数、侧枝叶片数、苞片数与PTP均呈线性关系;冠高比与PTP呈负指数关系。展开更多
The physiological and anatomical changes in leaves of Poinsettia (Euphorbia pulcherrima) tube_plantlets occurred in the process of transplantation and acclimation were investigated in this paper. Before transplantatio...The physiological and anatomical changes in leaves of Poinsettia (Euphorbia pulcherrima) tube_plantlets occurred in the process of transplantation and acclimation were investigated in this paper. Before transplantation and acclimation, leaves of the tube_plantlets were apparently thin and the vascular system was not well developed, and the net photosynthetic rate of the plantlet was low, but the stomatal conductance and transpiration rate of the leaves were relatively high. At the early stage of transplantation, the tube_plantlet was vulnerable to relative low humidity and intense light that could resulted in wilting of leaves due to excess water loss. During the acclimatization, the net photosynthetic rate of the plantlets increased progressively and the stomatal conductance and transpiration rate decreased gradually, accompanied by an increase in the thickness of the leaves and the size of leaf epidermal cells, together with the fully development of vascular system, palisade and spongy tissues in leaves. The results indicated that the acclimatization could greatly improve the photoautotrophic ability of the tube_plantlets, bring anatomical changes to the plantlets in order to avoid excessive leaf dehydration for the gradual adaptation of the plantlets to natural environment.展开更多
文摘以辐热积(每日温度相对热效应×光合有效辐射,Phototherm al product,PTP)为光温指标,通过不同扦插期的试验研究了温度和辐射与‘千禧’一品红发育和品质指标的定量关系,明确了从短日至单苞期、单蕾期、多蕾期、开花期所需要的PTP。结果表明标准化株高净增量(株高净增量/扦插苗初始叶面积)与PTP呈幂函数关系;主干叶片净增数、侧枝叶片数、苞片数与PTP均呈线性关系;冠高比与PTP呈负指数关系。
文摘The physiological and anatomical changes in leaves of Poinsettia (Euphorbia pulcherrima) tube_plantlets occurred in the process of transplantation and acclimation were investigated in this paper. Before transplantation and acclimation, leaves of the tube_plantlets were apparently thin and the vascular system was not well developed, and the net photosynthetic rate of the plantlet was low, but the stomatal conductance and transpiration rate of the leaves were relatively high. At the early stage of transplantation, the tube_plantlet was vulnerable to relative low humidity and intense light that could resulted in wilting of leaves due to excess water loss. During the acclimatization, the net photosynthetic rate of the plantlets increased progressively and the stomatal conductance and transpiration rate decreased gradually, accompanied by an increase in the thickness of the leaves and the size of leaf epidermal cells, together with the fully development of vascular system, palisade and spongy tissues in leaves. The results indicated that the acclimatization could greatly improve the photoautotrophic ability of the tube_plantlets, bring anatomical changes to the plantlets in order to avoid excessive leaf dehydration for the gradual adaptation of the plantlets to natural environment.
