Senescing leaves possess potential for stress adaptation: the developing leaves acclimated to high light exhibit increased tolerance to osmotic stress during senescence

Behera, Shashikanta; Nayak, Lalitendu; Biswal, Basanti

doi:10.1078/0176-1617-00791

Cited by 13 publications

(9 citation statements)

References 26 publications

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“…However, the plant materials used by Havaux (1992) and Hamerlynck et al (2000) were only treated for several days or hours, even several minutes (Lu and Zhang 1999). The adaptation of plants to environmental stress is closely associated with the phase and duration of the plants subjected to stress (Behera et al 2003). Furthermore, in the Weld, a number of diVerent stresses, such as water deWcit and high radiation, can occur simultaneously (Faria et al 1998).…”

Section: Discussionmentioning

confidence: 97%

Combined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass Leymus chinensis

Zhou

2006

Planta

262

151

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Drought and high-temperature stresses have been extensively studied; however, little is known about their combined impact on plants. In the present study, we determined the photosynthetic gas exchange, chlorophyll fluorescence, nitrogen level, and lipid peroxidation of the leaves of a perennial grass (Leymus chinensis (Trin.) Tzvel.) subjected to three constant temperatures (23, 29 and 32 degrees C), and five soil-moisture levels (75-80%, 60-65%, 50-55%, 35-40% and 25-30% of field capacity, respectively). High temperature significantly decreased plant biomass, leaf green area, leaf water potential, photosynthetic rate (A), maximal efficiency of PSII photochemistry (F (v)/F (m)), actual PSII efficiency (Phi(PSII)), the activities of nitrate reductase (NR; EC 1.6.6.1) and glutamine synthetase (GS; EC 6.3.1.2), but markedly increased the ratio of leaf area to leaf weight (SLA), endopeptidase (EP; EC 3.4.24.11) activity, and malondialdehyde (MDA) content, especially under severe water stress conditions. The A and F (v)/F (m) were significantly and positively correlated with leaf-soluble protein content, and the activities of NR and GS. However, both photosynthesis parameters were significantly and negatively correlated with EP activity and MDA content (P < 0.05). It is suggested that high temperature, combined with severe soil drought, might reduce the function of PSII, weaken nitrogen anabolism, strengthen protein catabolism, and provoke lipid peroxidation. The results also indicate that severe water stress might exacerbate the adverse effects of high temperature, and their combination might reduce the plant productivity and distribution range of L. chinensis in the future.

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Section: Discussionmentioning

confidence: 97%

Combined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass Leymus chinensis

Zhou

2006

Planta

262

151

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“…We have pointed out the needed phenological and structural plant measurements needed to specify leaf age, size, and place in the canopy over time. The molecular factors and genetics underlying leaf senescence is now being studied in detail in the laboratory and field (Biswal and Biswal 2000 http://www.ias.ac.in/currsci/sep25/articles19.htm, Behera et al 2003, Raghavendra et al 2003) some controlling genes had been identified and isolated; one only has to search the critical words (e.g. Biswal and Biswal 2000).…”

Section: The Cost : Benefit Ratio Of Ecosystem Modelling and Associatmentioning

confidence: 99%

How can calibrated research-based models be improved for use as a tool in identifying genes controlling crop tolerance to environmental stresses in the era of genomics-from an experimentalist's perspective

El‐Sharkawy¹

2005

Photosynt.

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Almost four decades have passed since the new field of ecosystem simulation sprang into full force as an added tool for a sound research in an ever-advancing scientific front. The enormous advances and new discoveries that recently took place in the field of molecular biology and basic genetics added more effective tools, have strengthened and increased the efficiency of science outputs in various areas, particularly in basic biological sciences. Now, we are entering into a more promising stage in science, i.e. 'post-genomics', where both simulation modelling and molecular biology tools are integral parts of experimental research in agricultural sciences. I briefly review the history of simulation of crop/ environment systems in the light of advances in molecular biology, and most importantly the essential role of experimental research in developing and constructing more meaningful and effective models and technologies. Such anticipated technologies are expected to lead into better management of natural resources in relation to crop communities in particular and plant ecosystems in general, that might enhance productivity faster. Emphasis is placed on developing new technologies to improve agricultural productivity under stressful environments and to ensure sustainable economic development. The latter is essential since available natural resources, particularly land and water, are increasingly limiting.

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“…Leaf senescence can be affected by a complex array of factors and manipulating any one of these factors will result in either promotion or prevention of leaf senescence, for example, water deficit promotes leaf senescence (Thomas et al, 1995). In many studies, PEG 6 000 is often used as an inducer of water deficit (osmotic stress) and promotes plant senescence (Behera et al, 2003). In the present experiment, adding PEG in the incubation medium of leaf discs induced leaf senescence, indicated by the considerable decrease of chlorophylls and soluble protein content (Figs.1 and 2).…”

Section: Discussionmentioning

confidence: 99%

Effects of osmotic stress on antioxidant enzymes activities in leaf discs of PSAG12-IPT modified gerbera

Lai

Bao

Zhu

et al. 2007

J. Zhejiang Univ. - Sci. B

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Leaf senescence is often caused by water deficit and the chimeric gene P SAG12 -IPT is an auto-regulated gene delaying leaf senescence. Using in vitro leaf discs culture system, the changes of contents of chlorophylls, carotenoids, soluble protein and thiobarbituric acid reactive substance (TBARS) and antioxidant enzymes activities were investigated during leaf senescence of P SAGl2 -IPT modified gerbera induced by osmotic stress compared with the control plant (wild type). Leaf discs were incubated in 20%, 40% (w/v) polyethylene glycol (PEG) 6 000 nutrient solution for 20 h under continuous light [130 µmol/(m 2 ·s)]. The results showed that the contents of chlorophylls, carotenoids and soluble protein were decreased by osmotic stress with the decrease being more pronounced at 40% PEG, but that, at the same PEG concentration the decrease in the transgenic plants was significantly lower than that in the control plant. The activities of superoxide dismutase (SOD), catalases (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (GPX) and dehydroascorbate reductase (DHAR) were stimulated by PEG treatment. However, the increases were higher in P SAG12 -IPT transgenic plants than in the control plants, particularly at 40% PEG treatment. Lipid peroxidation (TBARS content) was increased by PEG treatment with the increase being much lower in transgenic plant than in the control plant. It could be concluded that the increases in the activities of antioxidant enzymes including SOD, CAT, APX, GPX and DHAR were responsible for the delay of leaf senescence induced by osmotic stress.

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Senescing leaves possess potential for stress adaptation: the developing leaves acclimated to high light exhibit increased tolerance to osmotic stress during senescence

Cited by 13 publications

References 26 publications

Combined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass Leymus chinensis

Combined effects of water stress and high temperature on photosynthesis, nitrogen metabolism and lipid peroxidation of a perennial grass Leymus chinensis

How can calibrated research-based models be improved for use as a tool in identifying genes controlling crop tolerance to environmental stresses in the era of genomics-from an experimentalist's perspective

Effects of osmotic stress on antioxidant enzymes activities in leaf discs of PSAG12-IPT modified gerbera

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