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• W3142948403 abstract "Jon es (1) has discussed two main r easons for a t tempt i ng to manipulate stomata by br eeding . The first was to maximise productivit y and hen ce yi el d , by increasing r ates of assimilation of CO 2, An increas e in stomatal conductance would be exp ected to ac hi e ve this in C3 species by increasing the parti al pr essure of CO2 within the l eaf , p ., whi ch would be useful in co ndi t i ons wher e water supply is not limiting. The second was to improve drought tolerance . A de creased stomatal co nductance can aid in this direction, but at s ome expense to yi eld potential (yield in well-watered condi t i o ns ) . Jones al s o noted the barri ers to such att empts. These included compensation mechanisms when selection i s applied to one chara ct e r in isol ation , and the l arge proportion of the variation in s t omat a l characters which is phenotypically rather than ge ne t i ca l l y det ermined. The cor rel a t i on between s t omatal co nductance and photosynthetic r at e (and hence capacity) may be vi ewed in the context of both of these barriers . Korner et al. ( 2) observed the occur r enc e of this correl at ion among different species . He noted, as others have since, that when conductance is s mal l er , ca pa i ty al s o t en ds to be smal ler . Be ca us e of t hi s c ompensat i o , s e l e t i o n for, say, s mal l conductance for water-use effici ency might i nad vertently l ead to select i on f or s mal l capacity for CO2 fixation . It is also unclear to what e xtent t he correl ation i s phenotypically based. Won g et al . (3) also obs erved the correlation among different physiological treatments wi t hi n s pec ies . This ca uses one to as k how much of the correlation is non-genotypic, ie. how muc h of it i s physiologi cally bas ed . One could furt her ask what i s the natur e of the phys i ol og ica l basis. Won g e t al. s ugg es te d that some metabolit e from the mesophyll might be influencing t he e p i de r mis , per ha ps r efl ecting the e nergy s tat us of the mesophyll tissue (4), or the concent ra t i on of fr ee (u ndissociated ) a bscisic ac id (5). Al t er na t ive l y, there co uld be no link bet ween the ti s sues a t all, with the capacity and conductan ce responding separately, but in pr opor t i on with each other , to t he cha nge s in hormone l evels, nutrition, li ght intensity, etc. It has always been cl e a r that stomata ca n beh ave independe ntl y of the mesophyll, as wi t nes s t heir r esponses in e pi de r ma l peels . Regardles s of the nature of t he physiological basis, the cor relat i on between conductance and capac i ty among spec ies co ul d s t i l l be a physiological one, with no intrins ic, gene t ic differences in stom atal co nductance . Given that, perha ps t he stomat a of Euphorbia s pec i es , with conductanc es that a ppea r so wel l suited to the unde rlying" @default.
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• W3142948403 date "1987-01-01" @default.
• W3142948403 modified "2023-09-24" @default.
• W3142948403 title "GENETIC VARIATION IN THE RE LATIONSHIP BETWEEN PHOTOSYNTHETIC CO2 ASSI MILATION RATE AND STOMATAL CONDUCTANCE TO WATER LOSS" @default.
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