Abstract
The effect of drought on plant water relations and photosynthesis of Vigna glabrescens (Vg) and Vigna unguiculata (cvs. 1183, EPACE-1 and Lagoa), which differ in their drought resistance, was compared. With the increase of drought severity, Vg showed a more gradual stomatal closure and maintained significantly higher levels of stomatal conductance (gs) and photosynthetic activity (PN) than the other genotypes even when minimum relative water content (RWC) values were observed. Furthermore, Vg was the only genotype able to accumulate significant amounts of proline already under moderate water deficit, what could explain the lower osmotic potential (ψs) values observed in these plants. The three V. unguiculata cultivars presented a similar stomatal control under increasing water deficit. A mesophyllic impairment of photosynthetic capacity (Pmax) was detected for cv. 1183 from the beginning of drought onset (85-75 % RWC) while in the Vg plants the values remained unaffected along the whole drought period, indicating that PN decrease observed in this genotype is mainly a consequence of stomatal closure. Such Pmax maintenance suggests the existence of a high mesophyllic ability to cope with increasing tissue dehydration in Vg.
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Claims 9
Claim · model-written summary
Vigna glabrescens had more gradual stomatal closure as drought intensified.
Verbatim
e0“With the increase of drought severity, Vg showed a more gradual stomatal closure”
t0“Vigna glabrescens”
Claim · model-written summary
Vigna glabrescens maintained significantly higher stomatal conductance than other genotypes.
Verbatim
e0“maintained significantly higher levels of stomatal conductance (gs) and photosynthetic activity (PN) than the other genotypes even when minimum relative water content (RWC) values were observed.”
t0“Vigna glabrescens”
Claim · model-written summary
Vigna glabrescens maintained significantly higher photosynthetic activity than other genotypes.
- Taxon
- Vigna glabrescensVigna glabrescenst0
- Outcome
- photosynthetic activitye0
- Direction
- highere0
- Comparator
- other genotypese0
Verbatim
e0“maintained significantly higher levels of stomatal conductance (gs) and photosynthetic activity (PN) than the other genotypes even when minimum relative water content (RWC) values were observed.”
t0“Vigna glabrescens”
Claim · model-written summary
Only Vigna glabrescens accumulated significant proline under moderate water deficit.
Verbatim
e0“Vg was the only genotype able to accumulate significant amounts of proline already under moderate water deficit”
t0“Vigna glabrescens”
Claim · model-written summary
Vigna glabrescens had lower osmotic potential.
- Taxon
- Vigna glabrescensVigna glabrescenst0
- Outcome
- osmotic potentiale0
- Direction
- lowere0
Verbatim
e0“the lower osmotic potential (ψs) values observed in these plants.”
t0“Vigna glabrescens”
Claim · model-written summary
The three Vigna unguiculata cultivars had similar stomatal control under increasing water deficit.
- Taxon
- V. unguiculata
Vigna unguiculatae0 - Outcome
- stomatal controle0
- Direction
- similare0
- Qualifier
- increasing water deficite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The three V. unguiculata cultivars presented a similar stomatal control under increasing water deficit.”
Claim · model-written summary
Cultivar 1183 showed mesophyll photosynthetic capacity impairment from drought onset.
- Taxon
- Vigna unguiculataVigna unguiculatat0
- Material
- cv. 1183e0
- Outcome
- photosynthetic capacity (Pmax)e0
- Direction
- impairmente0
- Qualifier
- 85-75 % RWCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A mesophyllic impairment of photosynthetic capacity (Pmax) was detected for cv. 1183 from the beginning of drought onset (85-75 % RWC)”
t0“Vigna unguiculata”
Claim · model-written summary
Vigna glabrescens Pmax remained unaffected through the drought.
Verbatim
e0“in the Vg plants the values remained unaffected along the whole drought period”
t0“Vigna glabrescens”
Claim · model-written summary
The authors attribute Vigna glabrescens PN decline mainly to stomatal closure.
- Taxon
- Vigna glabrescensVigna glabrescenst0
- Outcome
- PN decreasee0
- Qualifier
- stomatal closuree0
Verbatim
e0“PN decrease observed in this genotype is mainly a consequence of stomatal closure.”
t0“Vigna glabrescens”