Changes in leaf protein and pigment contents and photosynthetic activities during senescence of detached maize leaves: influence of different ultraviolet radiations

Biswal, Basanti; Joshi, Padmanava; Kulandaivelu, G.

doi:10.1023/a:1006855532424

Cited by 28 publications

(7 citation statements)

References 27 publications

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“…In the current study, near ambient UV‐B radiation (7.7 kJ) reduced the P n of 30‐day‐old leaves by 50% compared with that at 0 kJ UV‐B radiation. In detached maize leaves, senescence induced loss of chlorophyll and photosynthesis was significantly enhanced by UV‐B radiation (Biswal et al 1997). Under high UV‐B of 15.1 kJ, the 12‐day‐old leaves had P n on par with the 30‐day‐old leaves in the control treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the changes in cell wall–air interfaces would affect the leaf reflectance. The internal leaf anatomy was also altered in senescing leaves (Boyer et al 1988, Biswal et al 1997). Foliar senescence is known to produce significant spectral fluctuations in the chlorophyll (450–750 nm), internal cellular geometry (750–1400 nm) and water content (1400–2500 nm) regions (Boyer et al 1988).…”

Section: Discussionmentioning

confidence: 99%

“…Projected environmental changes are not without consequences on plant ontogeny. Premature leaf senescence can be induced by several environmental factors, such as water deficit (Munne‐Bosch et al 2001), nitrogen deficit (Wolfe et al 1988), high temperature (Yang et al 2002), elevated CO 2 (Vaccari et al 2001), ultraviolet radiation (Cuello et al 1994, Biswal et al 1997), ozone and pathogens (Smart 1994, Gan and Amasino 1997). These environmental factors will greatly influence the onset of the senescence process and may accelerate ageing independent of natural recourse of leaf senescence.…”

Section: Introductionmentioning

confidence: 99%

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Senescence and hyperspectral reflectance of cotton leaves exposed to ultraviolet‐B radiation and carbon dioxide

Kakani

Reddy

Zhao

et al. 2004

Physiologia Plantarum

103

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The objectives of this study were to determine the effects of UV-B radiation and atmospheric carbon dioxide concentrations ([CO(2)]) on leaf senescence of cotton by measuring leaf photosynthesis and chlorophyll content and to identify changes in leaf hyperspectral reflectance occurring due to senescence and UV-B radiation. Plants were grown in controlled-environment growth chambers at two [CO(2)] (360 and 720 micro mol mol(-1)) and three levels of UV-B radiation (0, 7.7 and 15.1 kJ m(-2) day(-1)). Photosynthesis, chlorophyll, carotenoids and phenolic compounds along with leaf hyperspectral reflectance were measured on three leaves aged 12, 21 and 30 days in each of the treatments. No interaction was detected between [CO(2)] and UV-B for any of the measured parameters. Significant interactions were observed between UV-B and leaf age for photosynthesis and stomatal conductance. Elevated [CO(2)] enhanced leaf photosynthesis by 32%. On exposure to 0, 7.7 and 15.1 kJ of UV-B, the photosynthetic rates of 30-day-old leaves compared with 12-day-old leaves were reduced by 52, 76 and 86%, respectively. Chlorophyll pigments were not affected by leaf age at UV-B radiation of 0 and 7.7 kJ, but UV-B of 15.1 kJ reduced the chlorophylls by 20, 60 and 80% in 12, 21 and 30-day-old leaves, respectively. The hyperspectral reflectance between 726 and 1142 nm showed interaction for UV-B radiation and leaf age. In cotton, leaf photosynthesis can be used as an indicator of leaf senescence, as it is more sensitive than photosynthetic pigments on exposure to UV-B radiation. This study revealed that, cotton leaves senesced early on exposure to UV-B radiation as indicated by leaf photosynthesis, and leaf hyperspectral reflectance can be used to detect changes caused by UV-B and leaf ageing.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Senescence and hyperspectral reflectance of cotton leaves exposed to ultraviolet‐B radiation and carbon dioxide

Kakani

Reddy

Zhao

et al. 2004

Physiologia Plantarum

103

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show abstract

“…5C,F). Internal leaf anatomy has been reported to change in senescing leaves (51,52), and senescence is known to produce significant spectral fluctuations in the chlorophyll (450–750 nm), internal cellular geometry (750–1400 nm) and water content (1400–2500 nm) regions (51).…”

Section: Resultsmentioning

confidence: 99%

Interactive Effects of Ultraviolet‐B Radiation and Temperature on Cotton Physiology, Growth, Development and Hyperspectral Reflectance^¶

Reddy

Kakanl

Zhao

et al. 2004

Photochem & Photobiology

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Current conditions of 2–11 kJ m−2 day−1 of UV‐B radiation and temperatures of >30°C during flowering in cotton cultivated regions are projected to increase in the future. A controlled environment study was conducted in sunlit growth chambers to determent the effects of UV‐B radiation and temperature on physiology, growth, development and leaf hyperspectral reflectance of cotton. Plants were grown in the growth chambers at three day/night temperatures (24/16° C, 30/22° C and 36/28° C) and three levels of UV‐B radiation (0, 7 and 14 kJ m−2 day−1) at each temperature from emergence to 79 days under optimum nutrient and water conditions. Increases in main stem node number and the node of first fruiting branch and decrease in duration to first flower bud (square) and flower were recorded with increase in temperature. Main effects of temperature and UV‐B radiation were significant for net photosynthetic rates, stomatal conductance, total chlorophyll and carotenoid concentrations of uppermost, fully expanded leaves during squaring and flowering. A significant interaction between temperature and UV‐B radiation was detected for total biomass and its components. The UV‐B radiation of 7 kJ m−2 day−1 reduced boll yield by 68% and 97% at 30/22°C and 36/28° C, respectively, compared with yield at 0 kJ m−2 day−1 and 30/22° C. No bolls were produced in the three temperature treatments under 14 kJ m−2 day−1 UV‐B radiation. The first‐order interactions between temperature, UV‐B radiation and leaf age were significant for leaf reflectance. This study suggests a growth‐ and process‐related temperature dependence of sensitivity to UV‐B radiation.

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“…However, the available information related to its effect on plants is limited. The potential effects include inhibiting plant photosynthesis (Biswal et al 1997, Cullen et al 1992, Turcásanyi and Vass 2000) and causing DNA damage (Stary et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Application of the comet assay to measure DNA damage induced by UV radiation in the hydrophyte, Spirodela polyrhiza

Jiang

Wang

2007

Physiologia Plantarum

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The single-cell gel electrophoresis or comet assay is now widely used to detect DNA damage in animal cells induced by radiation or chemicals. Here, we apply the comet assay to measure ultraviolet (UV)-B-induced DNA damage in plant cells. The accepted animal cell protocol for the comet assay was modified to adapt it to plant cells. The major modifications were conversion of the plant cells to protoplasts and the use of T4 endonuclease V. As a positive control hydrogen peroxide was applied. Significant DNA damage was detected at 100 mM H 2 O 2 . This type of DNA damage was not affected by T4 endonuclease V treatment, which implies that the mechanism of H 2 O 2 -induced DNA damage was different from UV-B-induced DNA damage. Our results also indicate that both UV-A and UV-B radiation can induce DNA single-strand breaks in plant cells, while UV-B was more effective than UV-A for inducing pyrimidine dimer formation.

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Changes in leaf protein and pigment contents and photosynthetic activities during senescence of detached maize leaves: influence of different ultraviolet radiations

Cited by 28 publications

References 27 publications

Senescence and hyperspectral reflectance of cotton leaves exposed to ultraviolet‐B radiation and carbon dioxide

Senescence and hyperspectral reflectance of cotton leaves exposed to ultraviolet‐B radiation and carbon dioxide

Interactive Effects of Ultraviolet‐B Radiation and Temperature on Cotton Physiology, Growth, Development and Hyperspectral Reflectance^¶

Application of the comet assay to measure DNA damage induced by UV radiation in the hydrophyte, Spirodela polyrhiza

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Changes in leaf protein and pigment contents and photosynthetic activities during senescence of detached maize leaves: influence of different ultraviolet radiations

Cited by 28 publications

References 27 publications

Senescence and hyperspectral reflectance of cotton leaves exposed to ultraviolet‐B radiation and carbon dioxide

Senescence and hyperspectral reflectance of cotton leaves exposed to ultraviolet‐B radiation and carbon dioxide

Interactive Effects of Ultraviolet‐B Radiation and Temperature on Cotton Physiology, Growth, Development and Hyperspectral Reflectance¶

Application of the comet assay to measure DNA damage induced by UV radiation in the hydrophyte, Spirodela polyrhiza

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Product

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Interactive Effects of Ultraviolet‐B Radiation and Temperature on Cotton Physiology, Growth, Development and Hyperspectral Reflectance^¶