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Plant physiology

About: Plant physiology is a research topic. Over the lifetime, 1537 publications have been published within this topic receiving 72038 citations.


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Journal ArticleDOI
W. H. Sun1, Yanyou Wu1, X. Y. Wen1, S. J. Xiong1, H. G. He1, Y. Wang1, G. Q. Lu1 
TL;DR: It is found that there were similar change trends in CA activity and drought tolerance in violet orychophragmus, and in antioxidative enzymes and droughtolerance in tomato plants.
Abstract: Carbonic anhydrase (CA) catalyzes reversible hydration of CO2 and it can compensate for the lack of H2O and CO2 in plants under stress conditions. Antioxidative enzymes play a key role in scavenging reactive oxygen species and in protecting plant cells against toxic effects. Tomato represents a stress-sensitive plant while violet orychophragmus belongs to adversity-resistant plants. In order to study the drought responses in tomato and violet orychophragmus plants, CA and antioxidative enzyme activities, photosynthetic capacity, and water potential were determined in plants under drought stress. We found that there were similar change trends in CA activity and drought tolerance in violet orychophragmus, and in antioxidative enzymes and drought tolerance in tomato plants. Basic mechanisms of drought resistance should be identified for understanding of breeding measures in plants under stress conditions.

12 citations

Journal ArticleDOI
TL;DR: Tomato plants were grown in nutrient culture either continuously or discontinuously treated with FeSO4 or with Fe-EDTA, and plant metabolism has not been modified considerably by the use of the synthetic iron chelates.
Abstract: Tomato plants were grown in nutrient culture either continuously or discontinuously treated with FeSO4 or with Fe-EDTA. FeSO4 rapidly gave a precipitate of Fe2O3.nH2O but remained, under the conditions of the experiments, available to the plants. Fe absorbed from Fe-EDTA in the nutrient medium was less effective in inducing tomato plant growth than iron supplied as ferrous sulphate. This cannot be explained in terms of luxury consumption or by phosphate-induced internal iron immobilization.

12 citations

Journal ArticleDOI
TL;DR: There were significant differences in the extent of morphological and biochemical changes between the two poplar species, and P. przewalskii originating from high altitude could possess more efficient protective mechanisms than P. cathayana, which is from low-altitude habitats.
Abstract: Cuttings of Populus przewalskii and P. cathayana, which originated from high and low altitudes in southwest China, were used to examine the effect of water stress on the morphological, physiological and biochemical traits of plants in a greenhouse for one growing season. The dry mass accumulation and allocation, gas exchanges, extent of peroxidation damage, osmotic adjustment and antioxidative defenses, and amounts of pigments were measured to characterize the differences in peroxidation damage and protective mechanisms of two poplar species that contrast in drought tolerance. Under water stress, poplars showed a series of biochemical adjustments and morphological changes as follows: a decrease in leaf relative water content, gas exchanges, plant growth and dry mass accumulation; an increase in relative allocation to roots; an increase in the osmolyte contents (e.g. total amino acids). Additionally, water deficit induced an increase in peroxidation damage [as indicated by an increase in electrolyte leakage, malondialdehyde (MDA), carbonyl (C = O ) and hydrogen peroxide (H2O2) content], enhanced activities or contents of antioxidants (e.g. ascorbate peroxidase, guaiacol peroxidase, glutathione redutase and ascorbic acid) and reduced amounts of leaf pigments (e.g. chlorophyll and carotenoid). Furthermore, there were significant differences in the extent of morphological and biochemical changes between the two poplar species. Compared with P. cathayana, P. przewalskii responded to water stress by allocating relatively more to root dry mass, possessing a higher net photosynthesis rate, and having more efficient protective mechanisms, such as more osmolyte accumulation, stronger antioxidant activities and lower chlorophyll/carotenoid ratio. Thus, P. przewalskii suffered less damage as deduced from lower levels of electrolyte leakage, MDA, C=O and H2O2 content. Therefore, P. przewalskii originating from high altitude could possess more efficient protective mechanisms than P. cathayana, which is from low-altitude habitats.

12 citations

Journal ArticleDOI
TL;DR: The results suggest that flavodoxin-expressing plants would be better prepared to cope with this adverse situation, and concur with earlier observations reporting that hundreds of stress-responsive genes were induced in the absence of stress in these lines.

12 citations

Journal ArticleDOI
TL;DR: Additional data on the growth of the fungus as well as the yield of dry mycelium and fungal protein under different nutritional conditions are presented.
Abstract: The general scheme for microbial protein production (Gray, 1964, 1965, 1966) shows the conversion of green plant carbohydrates into fungal protein, which in turn can be converted to animal protein, which can then be used by man (GREEN PLANT CARBOHYDRATES ---+ FUNGUS PROTEIN --~ ANIMAL PROTEIN---+ MAN). We have already reported on the conversion of carob bean carbohydrates into fungal protein using the fungus Aspergillus niger, van Tieghem (Mitrakos et al., 1970). The carob bean sugars consist of a mixture of sucrose, glucose, fructose and maltose in a ratio of 5:1:1:0.7 (Mitrakos, 1968) and can be considered as a very good carbon source for fungal growth. In this paper we will present additional data on the growth of the fungus as well as the yield of dry mycelium and fungal protein under different nutritional conditions.

12 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023218
2022445
202179
202069
201967
201869