Publication Date
1993
Description
Four entries of Miscanthus spp., collected from different rainfall regions, were transplanted in pots. They were subjected to S drying cycles; each cycle lasted 6-7 days. Leaf photosynthesis (Pn) began to decline when leaf water potential (L) declined to •l.3 to -1.S MPa; the L values at SO% Pn (½Pn) were -1.6 to -2.6 MPa, The L (1hPn) values were lower in plants collected from northern Taiwan (highly frequent rainfall) than those collected from southern Taiwan (distinct wet and dry season). Further, the L (½Pn) value became lower in all the entries when drying cycle was advanced, with northern Taiwan plants decreasing severely in the third drying cycle, and southern Taiwan plants in the fifth drying cycle. Both stomata! and non-stomata! factors of photosynthesis were affected by water deficit. However, non-stomata! factor was more sensitive to water deficit. It showed that the entry differences in tolerance and photosynthetic acclimation to water deficit were closely related to the osmotic adjustment. Further, different capacity of osmotic adjustment of the entries could reflect the rainfall pallerns of different regions where the collected plants grew.
Citation
Weng, J, "Effects of Water Deficit on Osmotic Adjustment and Photosynthesis of Miscanthus spp. Collected from Different Rainfall Regions" (2024). IGC Proceedings (1993-2023). 39.
https://uknowledge.uky.edu/igc/1993/session12/39
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Effects of Water Deficit on Osmotic Adjustment and Photosynthesis of Miscanthus spp. Collected from Different Rainfall Regions
Four entries of Miscanthus spp., collected from different rainfall regions, were transplanted in pots. They were subjected to S drying cycles; each cycle lasted 6-7 days. Leaf photosynthesis (Pn) began to decline when leaf water potential (L) declined to •l.3 to -1.S MPa; the L values at SO% Pn (½Pn) were -1.6 to -2.6 MPa, The L (1hPn) values were lower in plants collected from northern Taiwan (highly frequent rainfall) than those collected from southern Taiwan (distinct wet and dry season). Further, the L (½Pn) value became lower in all the entries when drying cycle was advanced, with northern Taiwan plants decreasing severely in the third drying cycle, and southern Taiwan plants in the fifth drying cycle. Both stomata! and non-stomata! factors of photosynthesis were affected by water deficit. However, non-stomata! factor was more sensitive to water deficit. It showed that the entry differences in tolerance and photosynthetic acclimation to water deficit were closely related to the osmotic adjustment. Further, different capacity of osmotic adjustment of the entries could reflect the rainfall pallerns of different regions where the collected plants grew.
