High Temperature-Induced Abscisic Acid Biosynthesis and Its Role in the Inhibition of Gibberellin Action in Arabidopsis Seeds

Toh, Shigeo; Imamura, Akane; Watanabe, Asuka; Nakabayashi, Kazumi; Okamoto, Masanori; Jikumaru, Yusuke; Hanada, Atsushi; Aso, Yukie; Ishiyama, K.; Tamura, Noriko; Iuchi, Satoshi; Kobayashi, Masatomo; Yamaguchi, Shinjiro; Kamiya, Yûji; Nambara, Eiji; Kawakami, Naoto

doi:10.1104/pp.107.113738

Cited by 406 publications

(416 citation statements)

References 92 publications

(137 reference statements)

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“…In order to discern if our aging procedure induces secondary dormancy, we tested if there is an increase of ABA (Holdsworth et al, 1999;Braybrook and Harada, 2008), because it has been reported that high temperatures induce ABA biosynthesis during germination (Toh et al, 2008). Under our experimental conditions (high temperature during accelerated aging but normal temperature during germination), ABA levels are not increased ( Supplemental Fig.…”

Section: Isolation Of Arabidopsis Mutants With Increased Seed Longevitymentioning

confidence: 99%

ARABIDOPSIS THALIANA HOMEOBOX25 Uncovers a Role for Gibberellins in Seed Longevity

et al. 2013

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Seed longevity is crucial for agriculture and plant genetic diversity, but it is limited by cellular damage during storage. Seeds are protected against aging by cellular defenses and by structures such as the seed coat. We have screened an activation-tagging mutant collection of Arabidopsis (Arabidopsis thaliana) and selected four dominant mutants with improved seed longevity (isl1-1D to isl4-1D) under both natural and accelerated aging conditions. In the isl1-1D mutant, characterized in this work, overexpression of the transcription factor ARABIDOPSIS THALIANA HOMEOBOX25 (ATHB25; At5g65410) increases the expression of GIBBERELLIC ACID3-OXIDASE2, encoding a gibberellin (GA) biosynthetic enzyme, and the levels of GA 1 and GA 4 are higher (3.2-and 1.4-fold, respectively) in the mutant than in the wild type. The morphological and seed longevity phenotypes of the athb25-1D mutant were recapitulated in transgenic plants with moderate (4-to 6-fold) overexpression of ATHB25. Simultaneous knockdown of ATHB25, ATHB22, and ATHB31 expression decreases seed longevity, as does loss of ATHB25 and ATHB22 function in a double mutant line. Seeds from wild-type plants treated with GA and from a quintuple DELLA mutant (with constitutive GA signaling) are more tolerant to aging, providing additional evidence for a role of GA in seed longevity. A correlation was observed in several genotypes between seed longevity and mucilage formation at the seed surface, suggesting that GA may act by reinforcing the seed coat. This mechanism was supported by the observation of a maternal effect in reciprocal crosses between the wild type and the athb25-1D mutant.

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Section: Isolation Of Arabidopsis Mutants With Increased Seed Longevitymentioning

confidence: 99%

ARABIDOPSIS THALIANA HOMEOBOX25 Uncovers a Role for Gibberellins in Seed Longevity

et al. 2013

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“…Cell wall invertase gene expression is repressed by heat in sorghum, and starch and sugar content in anthers is downregulated (Aloni et al 2001;Pressman et al 2002;Jain et al 2007Jain et al , 2010. The hormone ABA has also been implicated in the response to heat stress (Toh et al 2008). This may be due to the fact that heat and drought stress often coincide.…”

Section: Heat Stressmentioning

confidence: 98%

Yield stability for cereals in a changing climate

Powell

Ravash

et al. 2012

Functional Plant Biol.

132

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Abstract. The United Nations Food and Agriculture Organisation (FAO) forecasts a 34% increase in the world population by 2050. As a consequence, the productivity of important staple crops such as cereals needs to be boosted by an estimated 43%. This growth in cereal productivity will need to occur in a world with a changing climate, where more frequent weather extremes will impact on grain productivity. Improving cereal productivity will, therefore, not only be a matter of increasing yield potential of current germplasm, but also of improving yield stability through enhanced tolerance to abiotic stresses. Successful reproductive development in cereals is essential for grain productivity and environmental constraints (drought, cold, frost, heat and waterlogging) that are associated with climate change are likely to have severe effects on yield stability of cereal crops. Currently, genetic gains conferring improved abiotic stress tolerance in cereals is hampered by the lack of reliable screening methods, availability of suitable germplasm and poor knowledge about the physiological and molecular underpinnings of abiotic stress tolerance traits.

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“…Temperature alters the growth potential of the embryo, and also influences hormone levels. At high temperatures, termo-inhibition may occur due to induction of ABA synthesis and repression of GA (Toh et al 2008) and in addition the growth potential of the embryo is markedly reduced (Nonogaki 2006). On the other hand, endogenous levels of GA are increased at low temperatures (Penfield 2008, Yamaguchi 2008.…”

Section: Introductionmentioning

confidence: 99%

Physiological, morphological and biochemical characteristics of the sexual propagation of Piper aduncum (Piperaceae)

Dousseau¹,

Alvarenga²,

Alves³

et al. 2011

Rev. bras. Bot.

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-(Physiological, morphological and biochemical characteristics of the sexual propagation of Piper aduncum (Piperaceae)). In this work we attempted to characterize the diaspores and the germination process of Piper aduncum L., as well as to verify the influence of the interaction between presence and absence of light (photoperiod of 12 hours and dark) and temperature (25 °C, 30 °C and 20-30 °C) and also of gibberellin (0, 50, 100, 200 and 400 mg L -1 ) on the root protrusion and normal seedlings formation. The diaspores are very small with a thousand seed weight of 0.3645 g, 13% moisture and protein reserve. Diaspores are strict positively photoblastic in the tested temperature range and the optimum temperature for root protrusion was 30 °C, while for normal seedlings was 25 °C. The previous permanence in the dark led to an increase in the speed of root protrusion and percentage and speed of seedling formation. The application of gibberellic acid negatively interfered with the protrusion and growth of the radicle while favoring the elongation of hypocotyls.Key words -germination, gibberellin, light, post-germination, temperature RESUMO -(Características fisiológicas, morfológicas e bioquímicas da propagação sexual de Piper aduncum (Piperaceae)). Buscou-se neste trabalho efetuar a caracterização dos diásporos maduros e do processo germinativo de Piper aduncum L., bem como verificar a influência da interação entre presença e ausência de luz (fotoperíodo de 12 horas e escuro) e temperaturas (25 °C, 30 °C e 20-30 °C) e do ácido giberélico (0, 50, 100, 200 e 400 mg L -1 ) sobre a germinabilidade e o vigor, considerando a protrusão radicular e as plântulas normais. Os diásporos são diminutos com peso de 0,3645 g para mil sementes, 13% de umidade e reserva protéica. São fotoblásticos positivos estritos, na faixa de temperatura testada e a temperatura ótima para a protrusão radicular foi 30 °C, enquanto que para a formação de plântulas normais foi 25 °C. A prévia permanência no escuro levou a um aumento na velocidade de protrusão radicular, e, principalmente, a porcentagem e velocidade de formação de plântulas foram favorecidas. A aplicação de ácido giberélico influenciou negativamente na protrusão e no crescimento da radícula e favoreceu o alongamento do hipocótilo.

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High Temperature-Induced Abscisic Acid Biosynthesis and Its Role in the Inhibition of Gibberellin Action in Arabidopsis Seeds

Cited by 406 publications

References 92 publications

ARABIDOPSIS THALIANA HOMEOBOX25 Uncovers a Role for Gibberellins in Seed Longevity

ARABIDOPSIS THALIANA HOMEOBOX25 Uncovers a Role for Gibberellins in Seed Longevity

Yield stability for cereals in a changing climate

Physiological, morphological and biochemical characteristics of the sexual propagation of Piper aduncum (Piperaceae)

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