Independent effects of the environment on the leaf gas exchange of three banana (Musa sp.) cultivars of different genomic constitution

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dc.contributor.author Thomas, DS
dc.contributor.author Turner, DW
dc.contributor.author Eamus, D
dc.date.accessioned 2011-02-07T06:21:34Z
dc.date.issued 1998-06-16
dc.identifier.citation Scientia Horticulturae, 1998, 75 (1-2), pp. 41 - 57
dc.identifier.issn 0304-4238
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/13423
dc.description.abstract Circumstantial evidence suggests that the Musa balbisiana (B) genome confers greater drought tolerance to bananas and plantains than the Musa acuminata (A) genome. Hence the genetic makeup of bananas and plantains may affect the response of leaf gas exchange to the environment. Field data cannot be readily used to study the independent effects of environment but laboratory studies allow independent control of environmental parameters. We examined the independent effects of photosynthetic photon flux density, 1, from 0 to 1450 μmol quanta m-2s-1, leaf temperature, T1, from 21°C to 43°C, and leaf-air vapour pressure difference, Δe, from 1.5 to 5.7 kPa on the stomatal conductance, g(s), transpiration, E(t), net photosynthesis, P(n), internal CO2 concentration, C(i), and instantaneous water use efficiency, E(w), of three Musa cultivars: cv Williams (AAA), cv Lady Finger (AAB), and cv Bluggoe (ABB). M. balbisiana genomes reduced the sensitivity of g(s) and P(n) to Δe more than M. acuminata genomes. Genomic composition did not affect the responses to T(1). As Δe increased, g(s) and P(n) declined linearly at the rate of approximately 10% of predicted maximum g(s) and P(n) per 1 kPa increase in Δe. This reduced stomatal aperture reduced C(i), which declined exponentially, thereby limiting P(n). Optimum temperatures for g(s) were 35°C and 39°C when Δe was 1.5 and 3.0 kPa respectively. Optimum temperatures for P(n) were about 29°C when Δe was 1.5 kPa and 33°C when Δe was 3.0 kPa. The predicted maximum temperature where P(n)=0.0 would occur was 43°C to 44°C for all responds regardless of Δe. The Williams cultivar was least sensitive to I showing less than 70% of predicted maximum photosynthesis and less than 50% of predicted maximum stomatal conductance at 1250 μmol quanta m-2 s-1. We conclude that there are genetic differences in the response of leaf gas exchange to changing environment within banana and plantains. The mechanism underlying the response of leaf gas exchange is through an effect of Δe and I on the stomata, rather than an effect of T(1) on photosynthetic activity. Increasing proportions of B genomes decrease the sensitivity of stomata to Δe but increases the sensitivity to I, especially at low photosynthetic photon flux densities. They also increase water use efficiency at the leaf level of organisation. The lower sensitivity of g(s) and P(n) to Δe of cultivars containing more B genomes is consistent with the view that the B genome contributes to drought tolerance in Musa sp.
dc.language eng
dc.relation.isbasedon 10.1016/S0304-4238(98)00114-9
dc.title Independent effects of the environment on the leaf gas exchange of three banana (Musa sp.) cultivars of different genomic constitution
dc.type Journal Article
dc.parent Scientia Horticulturae
dc.journal.volume 1-2
dc.journal.volume 75
dc.journal.number 1-2 en_US
dc.publocation Amsterdam en_US
dc.identifier.startpage 41 en_US
dc.identifier.endpage 57 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0706 Horticultural Production
dc.personcode 000006
dc.percentage 100 en_US
dc.classification.name Horticultural Production en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Acuminata
dc.description.keywords Balbisiana
dc.description.keywords Musa
dc.description.keywords Net photosynthesis
dc.description.keywords Stomatal conductance
dc.description.keywords Transpiration
dc.description.keywords Water use efficiency
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Faculty of Science/School of the Environment
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false


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