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- Title
Water and nutrient relationships between a mistletoe and its mangrove host under saline conditions.
- Authors
Chen, Luzhen; Li Huang; Xiaofei Li; Siyang You; Shengchang Yang; Yihui Zhang; Wenqing Wang
- Abstract
Xylem-tapping mistletoes are known to have generally higher transpiration rate (T[sub r]), lower CO[sub 2] assimilation rate (A) and therefore lower water-use efficiency (WUE) than their hosts. There are long-standing contradictions in water relations and nitrogen use in photosynthesis. Gas exchange, chlorophyll fluorescence and nutrition components were investigated in a special mistletoe-host pair, Viscum ovalifolium-Sonneratia caseolaris, as the host was a mangrove growing in a saline environment. Our results show that both plants had high foliar N content, therefore it was consistent with the N-parasitism hypothesis, although the mistletoe had a lower T[sub r] than its mangrove host. It was suggested that the mistletoe reduces its T[sub r] under salt stress with N sufficient conditions. The mistletoe had a fundamental limitation of photosynthesis, and was photoinhibited with regard to high salinity, but it developed more photoprotection to thermal radiation. Additionally, both stomatal conductance (g[sub s]) and mesophyll conductance (g[sub m]) limitations on photosynthesis dominated in the mistletoe under salt stress even though it had a high foliar N content similar to the host.
- Subjects
MISTLETOES; MANGROVE plants; PHOTOSYNTHESIS; PLANT cells &; tissues; GAS exchange in plants
- Publication
Functional Plant Biology, 2013, Vol 40, Issue 5, p475
- ISSN
1445-4408
- Publication type
Article
- DOI
10.1071/FP12218