... salinity, water stress, stomatal closure, decrease in intracellular CO2, and decrease in photosynthesis. The linear relation between photosyn-thesis and transpiration rates, the latter being ... method of Elstner and Heupel (1976) and Ganschow and Schike (1969), respectively, and these results were then normalized to total protein inthe sample. To investigate the effect of salt on enzyme ... inthe presenceof xanthineoxidase.A steep increase inthe activity of SOD began immediately following the transfer of the plant grown in water into a 500mM NaCl solution (Fig. 5). The SOD and...
... in Katherine seedlings (Fig. 4), and the prov-enances also differed in stress- inducedchanges in the partitioning of dry matterinto roots, stems and leaves (Fig. 5).Stressed ... differences between provenances in the production of hairs on the collar of ger-minating seedlings (Fig. 1 which bind the IIIseedling firmly to the soil and assist earlywater ... in the environment in whichthese provenances occur naturally (Gib-son and Bachelard, 1987). In this study, the effects of water stress on the initialestablishment and...
... speciesmay be able to explain these differences in drought-induced sensitivity to photoinhibi-tion. Still the higher tolerance to photoinhi-bition in Q cerris at a similar ... s-1.Then, the leaf disk was exposed to a PFD of1750 μmol m-2 s-1 for 135 min and finally put in the dark for 45 min to determine long-termchanges in maximal ... stress, high light and species responses need fur-ther analysis to elucidate such differential responses. It appears that the drought-induced increase in sensitivity to...
... SASSETA and three companies within each of the two sectors. Chapter 8, the final chapter, presents all the conclusions of the findings from the two studies conducted in both sectors and then makes ... epidemic to their core business. Thus, there is a need to conduct assessments of the impacts of HIV/AIDS andresponses thereto by companies. Obtaining such information would inform the concerned ... www.hsrcpress.ac.zaxxvMain findings of Studies 2A and 2B inthe legal services sectorEmployer perceptions of impact of HIV/AIDS on business The following main findings emerged:HIV/AIDS was not regarded as a business...
... lower in N. nitida and along with the photochemical efficiency inthe dark (Fv/Fm) they declined in both species. Non-photochemical quenching (NPQ)increased slowly in N. dombeyi along with the gradual ... drought intensity [6] the same PPFD became probably saturating at a Ψmlower than−2.5 MPa, producing the increase of NPQ in N. dombeyi and the concomitant decrease in Fv/Fm, ∆F/Fm and qP. In conclusion, ... higherWUE and photosynthesis under severe drought stress. Acknowledgements: We thank the staff of the Instituto de Botánicaof the Universidad Austral de Chile for their logistic support and maintenance...
... partners inthe phenomenon. In the zooxanthella, heat stress has been demonstrated to reduce the photosynthetic rate by decreasing the effi-ciency of the photosystem II [4–6] and ⁄ or by causingdamage ... degeneration[8,9,53,56] and ⁄ or gastrodermal detachment [7,52,57].Nevertheless, independently of the resulting effect of the thermal stress, all mechanisms point tothe involve-ment of oxidative stressinthe ... indicate the His and Cys residues of the putative active site located in the large subunit. The six a -helix components of the prodomain are underlined.Apoptosis and oxidative stressin bleaching...
... were examined for3 min. Each point represents the mean of six individual salt glands, andthe bars represent the SE of the mean. The insertsshow mean Na+fluxes and SE within the measuring periods.Columns ... was used in other NO-relatedexperiments. To clarify the role of NO in inducing high Na+secretionrate and maintaining low Na+ to K+ratio in leaves, specificNO synthesis inhibitors (N-nitro-L-arginine ... enhanced the Na+secretion rate, Na+percentage and Na+ to K+ratio inthe region of the salt gland, thus maintaining intracellular ionic homeostasis in the leaves, whereas inhibition of NO synthesis...
... tended to rise with increase in salinity. Total soluble sugar content in leaves of Sa and Sc increased by a larger margin in high salin-ity (> 30) than in low salinity (< 30). For Rs, total ... salinity. Net photosynthesis rate and stomata conductance of Sa and Sc decreased as salinity inthe culture medium rose from 0 to 40 (Figs. 1 and 2). When salinity was above 15, the decreasing ... photosynthesis rate of Rs increased appreciably inthe beginning (< 20) and decreased subse-quently (> 20), but the changes tended to be minor. Stomata conductance of Rs increased to...
... weak among the stakeholders. Inhibiting the improvement is lack of monitoring and evaluation on the ground which feeds into learning and adaptation. Public awareness about the institutional ... existing capacities, success and failures in performance of institutions, explaining possibilities and constraints for institutional capacity building and performance, and identifying and contrasting ... countries allows IFA to make a step further in finding answers to the question of how to increase domestic institutional capacities and enhance their practices in floods risk reduction towards greater...
... system, thereby changing the activity of the chloroplast. To what extent the closure of the stoma affects the photosynthesis rate depends on the partial pressure of CO2 in the lamina. However ... salinity was greater than 40. No changes were observed inthe MDA content of roots inthe three mangrove species. The adaptabilities of Sa and Sc tosalt tolerance were limited. The more salt tolerant ... tended to rise with increase in salinity. Total soluble sugar content in leaves of Sa and Sc increased by a larger margin in high salin-ity (> 30) than in low salinity (< 30). For Rs, total...
... removedfrom storage, thawed, acclimated to light and returned tothe containersas described above. These seedlings are referred to below as dormantseedlings. Seedling morphology at the beginning of the ... sensor). The frame was removed at 0500 h the next morning and 10 seedlings from both groups (dormant + growing) were trans-ferred tothe laboratory in a cool bag. Inthe laboratory, the seedlingshoots ... seedlings were exposed to drought after planting, rootegress of growing seedlings showed a considerable decline. On the other hand, root egress in dormant seedlings was ratherinsensitive to drought,...
... directed to repair processes.However, after 85 days, the NR activity inthe seedlings waslower and decreased with increasing O3. At that time in the season and with increasing oxidative stress, ... photorespiration to oxidative stress and contradictory results have been observed. Dizengremel and Pétrini [9] observed an increase inthe photorespirationpathway in plants under pollutant stress. ... cases, the slope and the intercept of the regressions were not different from zero (Tabs. I,II and III). Therefore, we pooled the data from both light intensitiesfor the analysis of the effect of the...
... 1.5–2.5 m from the ground in the evening hours of the day previous tothe day of the measurement, sealed in a polythene bag to reduce evapo-rative loss of water and taken tothe laboratory. Here ... of water stressand could thereforeincrease the chances of this species to compete with the other treeline species for the colonisation of the alpineareas rendered suitable to seedling establishment ... decreasing to their mini-mum at the beginning of August (day 214). The valuesobtained on day 213 for P.cembra were slightly higher. The relative water content at turgor loss point (RTLP) and the...
... flats in the floodplain(Hodges and Switzer, 1979; Tanner, 1986).These sites are frequently flooded, canremain saturated into the growing season, and exhibit poor internal ... resistance to root hypoxia. The hypothesis was tested on seedlings during the establishment phase in Experiment 1, and it was tested on seedlings late in theirfirst growing season ... flood-induced stomatal and photosynthetic responses of three bottomland tree species. For Sci 32, 914-923Ponnamperuma FN (1984) Effects of flooding on soils. In: Flooding and Plant...
... related to pollinicenzymes involved in pollen tube metabo-lism, such as ¡3-galactosidase. Its activitycould be the final result of a series of inter-actions started by initial ... the compat-ible pollen tube, shifting from an auto-trophic to a heterotropic type of nutrition. Biochemical studies focused on pollinic and stigmatic proteins, known to ... be in- volved in male-female interactions(Gaude and Dumas, 1987). After silvernitrate staining, qualitative and quantita-tive differences could be observed, related to the...