Variation in thylakoid proteins and photosynthesis in Syrian landraces of barley

Watanabe, Naoharu; Naruse, J.; Austin, R. B.; Morgan, Colin

doi:10.1007/bf00029563

Cited by 16 publications

(11 citation statements)

References 19 publications

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“…By contrast, loss of chl b was always larger in the tolerant than in the sensitive Al-cultivar throughout the experiment. As a whole, these decreases reflect a reduction in the chl antenna size of the photosystems and might protect the photosystems from photoinhibition by reducing energy delivery to the reaction centers (17). Such a reduction initially occurred to a greater extent in the tolerant in relation to the sensitive cultivar, but both displayed similar total chl concentrations at the end of the experiment (Fig.…”

Section: Resultsmentioning

confidence: 92%

Responses of the Photosynthetic Apparatus to Aluminum Stress in Two Sorghum Cultivars

Peixoto

Matta

2002

Journal of Plant Nutrition

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This work focused on the effects of aluminum (Al) stress on photosynthetic apparatus using Al-tolerant and sensitive cultivars of sorghum (Sorghum bicolor (L.) Moench). Plants were grown in Clark's nutrient solution aerated continuously and adjusted daily to pH 4.0 and containing two Al concentrations (0 and 185 mmol m À 3 ) supplied as Al 2 (SO 4 ) 3 Á 18H 2 O. Measurements were performed on recently expanded leaves from the eighth to sixteenth day after imposing Al treatments. In general, chloroplastidic pigment concentration, chlorophyll fluorescence parameters, and photosynthetic rates were initially affected by Al stress to a greater extent in the Al-tolerant cultivar than in the susceptible cultivar. However, the Al-tolerant genotype JOURNAL OF PLANT NUTRITION, 25(4), 821-832 (2002) 821 seemed to cope with high Al via progressive, sustained decreases in initial chlorophyll fluorescence and increases in chlorophyll a=b ratio, photosystem II photochemical efficiency, net carbon assimilation rate, and photosynthetic oxygen evolution. In contrast, the Al-sensitive cultivar did not show any apparent acclimation response to high Al application. The results suggest that the harmful effects of Al on photosynthesis might be partially alleviated through time-dependent mechanisms, particularly in the Al-tolerant sorghum cultivar.

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Section: Resultsmentioning

confidence: 92%

Responses of the Photosynthetic Apparatus to Aluminum Stress in Two Sorghum Cultivars

Peixoto

Matta

2002

Journal of Plant Nutrition

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“…Analogically to analysed features most of chlorophyll mutations in rye (BREWBAKER 1926;Mi.JNTZING 1963;DE VRIES and SYBENGA 1984;SMIRNOV and SosNICHINA 1984;KuBICKA 1986, 1994: GABARA and KuBICKA 1991GABARA et al 1991) were determined by a single, recessive gene. WATANABE et al (1995) found that lower chlorophyll content was responsible for light green leaves in Hordeum vulgare. On the other hand, our earlier studies demonstrated the reduction in the number of chloroplasts in light green plants of rye (GABARA and KuBICKA 1991).…”

Section: Discussionmentioning

confidence: 99%

Yellowish—brown changes on leaves of winter rye (Secale cereale L.)

Kubicka

Gabara²,

Janas

1998

Caryologia

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SUMMARY -Two mutants of winter rye (Secale cereale L.) (hs 1 and hs 2 ) with yellowish-brown changes on leaves are described. Both forms were characterized by a lower number of tillers, but the heigth of plants and length of ears were similar to those in control plants. In mesophyll cells of these mutants the number of chloroplasts and grana and the chlorophull content were lower than those in dark green plants.

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“…This reduces photosynthetically active radiation (PAR) absorption and subsequently water use. Such varieties were found adapted to dry and cold conditions (Watanabe et al 1995). However, at the same time, these reflective properties that are beneficial under drought stress were often associated with reduced photosynthesis and yield potential (Premachandra et al 1994;Sanchez et al 2001).…”

Section: Reduced Water Usementioning

confidence: 99%

Drought resistance, water-use efficiency, and yield potential—are they compatible, dissonant, or mutually exclusive?

Blum¹

2005

Aust. J. Agric. Res.

1,180

829

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This presentation is a concept review paper dealing with a central dilemma in understanding, designing, and acting upon crop plant improvement programs for drought conditions. The association among yield potential (YP), drought resistance (DR), and water-use efficiency (WUE) is often misunderstood, which in turn can lead to conceptual oversight and wrong decisions in implementing breeding programs for drought-prone environments.Although high YP is the target of most crop breeding programs, it might not be compatible with superior DR. On the other hand, high YP can contribute to yield in moderate stress environments. Plant production in water-limited environments is very often affected by constitutive plant traits that allow maintenance of a high plant water status (dehydration avoidance). Osmotic adjustment (OA) is a major cellular stress adaptive response in certain crop plants that enhances dehydration avoidance and supports yield under stress. Despite past voiced speculations, there is no proof that OA entails a cost in terms of reduced YP.WUE for yield is often equated in a simplistic manner with DR. The large accumulation of knowledge on crop WUE as derived from research on carbon isotope discrimination allows some conclusions on the relations between WUE on the one hand, and DR and YP on the other, to be made. Briefly, apparent genotypic variations in WUE are normally expressed mainly due to variations in water use (WU; the denominator). Reduced WU, which is reflected in higher WUE, is generally achieved by plant traits and environmental responses that reduce YP. Improved WUE on the basis of reduced WU is expressed in improved yield under water-limited conditions only when there is need to balance crop water use against a limited and known soil moisture reserve. However, under most dryland situations where crops depend on unpredictable seasonal rainfall, the maximisation of soil moisture use is a crucial component of drought resistance (avoidance), which is generally expressed in lower WUE.It is concluded that the effect of a single 'drought adaptive' gene on crop performance in water-limited environments can be assessed only when the whole system is considered in terms of YP, DR, and WUE.

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Variation in thylakoid proteins and photosynthesis in Syrian landraces of barley

Cited by 16 publications

References 19 publications

Responses of the Photosynthetic Apparatus to Aluminum Stress in Two Sorghum Cultivars

Responses of the Photosynthetic Apparatus to Aluminum Stress in Two Sorghum Cultivars

Yellowish—brown changes on leaves of winter rye (Secale cereale L.)

Drought resistance, water-use efficiency, and yield potential—are they compatible, dissonant, or mutually exclusive?

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