Role of abscisic acid in chilling tolerance of rice (<i>Oryza sativa</i> L.) seedlings. I. Endogenous abscisic acid levels

Lee, Tse‐Min; Lur, Huu‐Sheng; Cai, Chun

doi:10.1111/j.1365-3040.1993.tb00895.x

Cited by 79 publications

(63 citation statements)

References 44 publications

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“…16,17) There was also a reported attempt to protect rice plants against the cold stress using an ABA analogue.18) In addition, it was shown that endogenous ABA levels were higher in cold-tolerant rice seedlings than in cold-sensitive rice seedlings after exposure to low temperatures. 19,20) Our results also demonstrated that ABA reduced the ratio of leaf rolling (Tables 1 and 2) and the electrolyte leakage (Fig. 2).…”

Section: Discussionsupporting

confidence: 64%

Improvement of Cold Resistance in Rice Seedlings by 5-Aminolevulinic Acid

Hotta¹,

Tanaka²,

Luo

et al. 1998

J. Pestic. Sci.

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5-Aminolevulinic acid (ALA) at low concentrations increased cold resistance in rice seedlings. The pretreatment of rice seedlings by root-soaking with ALA solution at 0.1-1 ppm reduced the ratio of leaf rolling and electrolyte leakage from leaf tissue after cold treatment. Thirty days after cold treatment at 5C for 5 days, the plants treated with 1 ppm ALA resulted in 85% survival ratio, 6.1 leaves per plant and 111.8 mg dry weight per aerial part of seedling, while 65%, 5.9 and 65.0 mg respectively in the control plants. The dry weight of seedlings treated with ALA increased 1.7 folds as compared to the control plants. These results are the first evidence that ALA has protective effects against cold stress in rice seedlings. Abscisic acid (ABA) and brassinolide (BR) also increased the cold resistance in our bioassay system. Protective effect of BR at 0.001 ppm against cold stress was similar to that of ALA. However, protective effect of ABA was different from that of ALA in terms of the ratio of leaf rolling after cold stress. ABA protected young leaves rather than old ones, while ALA and BR were more effective on the protection of old leaves.

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Section: Discussionsupporting

confidence: 64%

Improvement of Cold Resistance in Rice Seedlings by 5-Aminolevulinic Acid

Hotta¹,

Tanaka²,

Luo

et al. 1998

J. Pestic. Sci.

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“…If root and shoot are exposed to low temperature, stomata cannot be closed in spite of root leaf water status. This failure of stomatal control in addition to decreased root hydraulic conductance can further aggravate chilling induced water stress (Lee et al 1993). All EBR treatments decreased the membrane injury index in maize leaves at both control and stress condition except at 7DAT in stress condition.…”

Section: Resultsmentioning

confidence: 99%

Physiological and biochemical effect of 24-epibrassinoslide on cold tolerance in maize seedlings

Singh

Kumar

Singh

et al. 2012

Physiol Mol Biol Plants

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Germination and early seedling growth are important for establishment of maize because maize is chilling sensitive crop and low temperature during early period of growth can be detrimental to subsequent crop growth and productivity. Therefore, it is important to protect maize seedling from cold stress. A study was conducted on induced cold tolerance by 24-epibrassinoslide (EBR) at the Indian Agricultural Research Institute, New Delhi, India. Maize seedlings were raised in green house condition (25/18°C day-night temperatures). Ten days old seedlings were treated with EBR (0.0, 0.01, 0.1, 1.0 and 10 μM) and then divided into two sets, one set was kept in greenhouse (25/18°C day-night temperatures) and another was transferred to net house (cold stress). Data on various morpho-physiological traits was recorded after 7, 14 and 21 days of treatment. Exogenous application of 1.0 μM EBR had significant effect on growth and morpho-physiological traits under both conditions. The maize seedlings treated with EBR were more tolerant to cold stress than the untreated one. Significant increase in plant height, dry matter accumulation, chlorophyll content, total soluble proteins and starch contents was observed under both conditions, however, the results were more pronounced under cold stress. 1.0 μM concentration being the most effective under both conditions. Maintenance of high tissue water content, reduced membrane injury index, increased total chlorophyll, soluble sugar and protein content were taken as the possible indicators of EBR induced chilling tolerance.

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“…Low soil temperatures are known to inhibit L p and induce stomatal closure in aspen (Wan et al, 1999). It is possible that, like low root temperature (Chen et al, 1983;Lee et al, 1993) and drought (Zhang et al, 1987;Lång et al, 1994), HgCl 2 treatment triggered ABA synthesis, which directly caused stomatal closure. This could explain the slow recovery of stomatal opening following ME treatment.…”

Section: Discussionmentioning

confidence: 99%

Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings

1999

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HgCl 2 (0.1 mM) reduced pressure-induced water flux and root hydraulic conductivity in the roots of 1-year-old aspen (Populus tremuloides Michx.) seedlings by about 50%. The inhibition was reversed with 50 mM mercaptoethanol. Mercurial treatment reduced the activation energy of water transport in the roots from 10.82 ؎ 0.700 kcal mol ؊1 to 6.67 ؎ 0.193 kcal mol ؊1 when measured over the 4°C to 25°C temperature range. An increase in rhodamine B concentration in the xylem sap of mercury-treated roots suggested a decrease in the symplastic transport of water. However, the apoplastic pathway in both control and mercurytreated roots constituted only a small fraction of the total root water transport. Electrical conductivity and osmotic potentials of the expressed xylem sap suggested that 0.1 mM HgCl 2 and temperature changes over the 4°C to 25°C range did not induce cell membrane leakage. The 0.1 mM HgCl 2 solution applied as a root drench severely reduced stomatal conductance in intact plants, and this reduction was partly reversed by 50 mM mercaptoethanol. In excised shoots, 0.1 mM HgCl 2 did not affect stomatal conductance, suggesting that the signal that triggered stomatal closure originated in the roots. We suggest that mercury-sensitive processes in aspen roots play a significant role in regulating plant water balance by their effects on root hydraulic conductivity.Several criteria have been used to infer the presence of water-transporting channels in cell membranes. These include a high ratio of osmotic to diffusional water permeability (P f /P d Ͼ1), low Arrhenius activation energy (E a Ͻ 6 kcal mol Ϫ1 ) for water transport, and its reversible inhibition by mercury sulfhydryl reagents (for reviews, see Chrispeels and Agre, 1994;Verkman et al., 1996;Maurel, 1997). The transport of water through the lipid bilayer has a high E a , usually above 10 kcal mol Ϫ1 (Macey, 1984). Water transport can also be via water channel proteins (aquaporins), which have been found in the tonoplasts (Maurel et al., 1993) and plasma membranes (Kammerloher et al., 1994) of plants. It is generally acknowledged that the transport of water via channels is less temperature dependent and has a lower E a (Ͻ 6 kcal mol Ϫ1 ) than transport via the lipid pathway (Finkelstein, 1987;Chrispeels and Agre, 1994). Water transport via aquaporins is characteristically inhibited by mercurial reagents, which react with sulfhydryl groups in the channel proteins and result in closure of the channels. This closure inhibits water transport and increases E a to the level of that for transport through the lipid pathway (Macey, 1984). An inhibition of water transport by mercury was reported in cell membranes isolated from higher plants Niemietz and Tyerman, 1997) and in whole root systems (Maggio and Joly, 1995;Carvajal et al., 1996). However, the effects of mercury reagents on E a have not been investigated in intact higher plants.Based on the composite transport model (Steudle and Frensch, 1996), water transport is via three parallel pathways, apoplastic, ...

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Role of abscisic acid in chilling tolerance of rice (Oryza sativa L.) seedlings. I. Endogenous abscisic acid levels

Cited by 79 publications

References 44 publications

Improvement of Cold Resistance in Rice Seedlings by 5-Aminolevulinic Acid

Improvement of Cold Resistance in Rice Seedlings by 5-Aminolevulinic Acid

Physiological and biochemical effect of 24-epibrassinoslide on cold tolerance in maize seedlings

Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings

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