附生和扎根的红果子蔓（Clusia rosea Jacq.）的光合作用

Photosynthesis in epiphytic and rooted Clusia rosea Jacq.

作者信息

Sternberg L da S L, Ting I P, Price D, Hann J

机构信息

Department of Biology, University of Miami, 33124, Coral Gables, FL, USA.

Department of Botany and Plant Sciences, University of California, 92521, Riverside, CA, USA.

出版信息

Oecologia. 1987 Jun;72(3):457-460. doi: 10.1007/BF00377579.

DOI:10.1007/BF00377579

PMID:28311145

Abstract

Clusia rosea Jacq. is a hemiepiphyte having Crassulacean Acid Metabolism (CAM). In its natural habitat Clusia begins its life cycle as an epiphyte and eventually becomes a rooted tree. These two stages of the life cycle of Clusia represent markedly different water regimes. Our CO exchange, stomatal conductance, titratable acidity, and stable carbon isotope ratio measurements indicate that Clusia has a flexible photosynthetic mode, where CO is fixed mostly via CAM during its epiphytic stage, when water availability is low, and via both CAM and C during its rooted stage.

摘要

玫瑰红秋海棠是一种具有景天酸代谢（CAM）的半附生植物。在其自然栖息地，玫瑰红秋海棠以附生植物的形式开始其生命周期，最终成为一棵扎根的树。玫瑰红秋海棠生命周期的这两个阶段代表了明显不同的水分状况。我们对二氧化碳交换、气孔导度、可滴定酸度和稳定碳同位素比率的测量表明，玫瑰红秋海棠具有灵活的光合模式，在其附生阶段，当水分供应不足时，二氧化碳主要通过景天酸代谢固定，而在其扎根阶段则通过景天酸代谢和C3途径固定。