Abstract
Net photosynthesis (Pn) of two ecotypes of redbud ( Cercis canadensis L.) was studied following growth under high temperatures and increasing drought. Although mexican redbud [ C. canadensis var. mexicana (Rose) M. Hopkins] exhibited greater Pn than eastern redbud ( C. canadensis var. canadensis L.), Pn decreased at a similar rate under water deficit stress for both ecotypes. Mexican redbud also had greater instantaneous water use efficiency [net photosynthesis: transpiration (WUE)] than eastern redbud. Differences in both Pn and WUE might have been due to differences in leaf thickness. The optimum temperature for potential photosynthetic capacity (37 °C) was unaffected by irrigation or ecotype. Tissue osmotic potential at full turgor was more negative in eastern redbud, but was unaffected by drought stress in either ecotype. Soluble carbohydrate content was higher in eastern redbud, and in both ecotypes, d -pinitol was the major soluble carbohydrate and was considerably more abundant in the water-stressed plants. Total polyol content (myo-inositol + ononitol + pinitol) was also greater in the water-stressed plants. Both ecotypes were very tolerant of high temperatures and drought.
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Claims 10
Claim · model-written summary
Mexican redbud had greater net photosynthesis than eastern redbud.
Verbatim
e0“mexican redbud [ C. canadensis var. mexicana (Rose) M. Hopkins] exhibited greater Pn than eastern redbud ( C. canadensis var. canadensis L.)”
Claim · model-written summary
Net photosynthesis decreased similarly under water deficit in both ecotypes.
Not reportedComparator
Verbatim
e0“Pn decreased at a similar rate under water deficit stress for both ecotypes”
t0“Redbud”
Claim · model-written summary
Mexican redbud had greater instantaneous water use efficiency than eastern redbud.
Verbatim
e0“Mexican redbud also had greater instantaneous water use efficiency [net photosynthesis: transpiration (WUE)] than eastern redbud”
Claim · model-written summary
The photosynthetic optimum was 37 °C and did not vary by irrigation or ecotype.
Verbatim
e0“optimum temperature for potential photosynthetic capacity (37 °C) was unaffected by irrigation or ecotype”
t0“Redbud”
Claim · model-written summary
Eastern redbud had more negative osmotic potential at full turgor.
Verbatim
e0“Tissue osmotic potential at full turgor was more negative in eastern redbud”
Claim · model-written summary
Drought did not affect osmotic potential in either redbud ecotype.
Not reportedComparator
Verbatim
e0“was unaffected by drought stress in either ecotype”
t0“Redbud”
Claim · model-written summary
Eastern redbud had higher soluble carbohydrate content.
Verbatim
e0“Soluble carbohydrate content was higher in eastern redbud”
Claim · model-written summary
D-pinitol was the major soluble carbohydrate in both ecotypes.
Verbatim
e0“in both ecotypes, d -pinitol was the major soluble carbohydrate”
t0“Redbud”
Claim · model-written summary
D-pinitol was more abundant in water-stressed redbud plants.
Not reportedComparator
Verbatim
e0“d -pinitol was the major soluble carbohydrate and was considerably more abundant in the water-stressed plants”
t0“Redbud”
Claim · model-written summary
Total polyol content was greater in water-stressed redbud plants.
Not reportedComparator
Verbatim
e0“Total polyol content (myo-inositol + ononitol + pinitol) was also greater in the water-stressed plants”
t0“Redbud”