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Root tips of the wilty pepper mutant scarbrous diminutive accumulateless rubidium than those of the normal genotype. This phenomenonwas evident in root tips excised from plants maintained for2 d in CaSO4 solution (low salt plants), especially in the lowerexternal concentration range (0.1– 1.0 mM) of RbCl. Theefflux rate of Rb+ from mutant root tips was twice as high asin normal root tips. These results indicate that the ability of the mutant rootsto absorb and accumulate Rb+ and K+ is impaired. This defectcould be a consequence of either an impaired Na+/K+ carriersystem, or increased leakiness of mutant membranes, or both. The fact that the normal roots can accumulate Rb+ much fasterthan mutant roots supports the first alternative, i.e. thatthe high affinity carrier system was impaired in the mutantroots. However, the higher efflux rate of Rb+ from the mutantroots suggests that membrane leakiness was also affected.  相似文献   
2.
Leaves of the wilty pepper mutant, scabrous diminutive, accumulatemore Na+ than those of the normal genotype, when both grow inmedium containing N+. It seems that the regulation of Na+ fluxin the mutant root was modified. Net uptake of Na+ was muchhigher and efflux of 22Na+ was lower in the mutant roots thanin the normal ones. Two possible explanations for these differencesbetween mutant and normal plants are discussed, namely (a) achange in membrane permeability and (b) a change in the mechanismof Na+ extrusion.  相似文献   
3.
Detached tobacco (Nicotiana rustiest L.) leaves were exposed for 2 min to a temperature range of 24° to 47.5°C. The heat treatment enbanced O2 uptake by 30 Vs. Likewise, amylolytic activity in chloroplast extracts was intensified; this activity being observed also in situ. The enhancements can be reversed either by short-term cold treatment (7°C for 10 min), or by application of kinetin.  相似文献   
4.
FRUIT DEVELOPMENT AND WAX BIOSYNTHESIS IN JOJOBA   总被引:1,自引:0,他引:1  
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5.
The present paper examines whether leaves subjected to heat or salt pretreatment are better adapted to heat shock than untreated leaves. Such adaptation could result from either acquired thermo-stability and/or better recovery. The rates of metabolic processes such as 14CO2 fixation, 14C-leucine incorporation into the TCA insoluble fraction, 32P incorporation into phospholipids and 36Cl efflux were used as indicators of adaptability. It was found that pretreatments (heat or salt) protect leaves only slightly against the short-term effects of a heat treatment, but have a pronounced effect on recovery. Cytokinin level was reduced by heat shock, and as in the case of metabolic response, pretreatment had no effect on this reduction.  相似文献   
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The efflux of 36C and 14C metabolites from heat-treated tissue was studied. A two-minute heat treatment at 47.5°C increased the leakiness of the membranes. The heat effect may be reversed either by treatment with kinetin or may occur spontaneously with time. The spontaneous reversal is tem—perature dependent and resembles the recovery of CO2 fixa—tion after heat treatment. The loss of membrane integrity is reflected in the rate of incorporation of 32P into phospho—lipids.  相似文献   
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