Participation of Phytohormones in the Stomatal Regulation of Gas Exchange During Water Stress

Pospíšilová, Jana

doi:10.1023/a:1024894923865

Cited by 160 publications

(70 citation statements)

References 191 publications

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“…Hormone signaling pathways form complex interacting network, which enables perceiving of numerous internal and external stimuli and generating respective plant responses. Additionally, exogenously applied growth regulators can alter the content of endogenous phytohormones (Pospíšilová 2003), therefore one of reasons for the results of present study indicated that stored primed seeds had more germination characteristics than fresh primed seeds is probably the enzyme and hormonal disorders in seed that causes more activity. The superiority in speed of germination of KNO 3 priming was related to more nitrogen and potassium accumulation in seeds treated with KNO 3 .…”

Section: Methodsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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The Effects of Source of Priming and Post-priming Storage Duration on Seed Germination and Seedling Growth Characteristics in Wheat (Triticum aestivem L.)

Abnavi¹,

Ghobadi²

2012

JAS

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This study was designed to investigate the effects of seed storing after priming on germination of two wheat cultivars (Cross Alborz and Sardari). The study consisted of five experiments. In experiments 1-4 we tested seed priming with distilled water (hydro priming), potassium nitrate (KNO 3 ), gibberellin (GA 3 ), PEG-6000 (osmopriming) in different concentrations (50, 100 150 and 200 ppm for GA 3 ) and (1%, 2%, 3% and 4% for KNO 3 ) and times (12, 18, 24 and 30 hours). Germination tests were subsequently performed on all above mentioned seed priming methods. The best treatment (time and concentration of media) which emanated from experiments 1-4 was considered for experiment 5. In experiment 5, we tested the effects of storing duration after seed priming (0, 30, 45 and 60 days) on germination characteristics of wheat. Maximum stem and radicle length, stem and radicle dry weight and speed of germination in cv. Cross Alborz and cv. Sardari were observed in priming treatments when the seeds primed by GA 3 50 ppm for 24h, KNO 3 1% for 24h, hydropriming 12h and osmopriming 12h.The results showed that storing of primed seeds improved shoot and radicle length, shoot and radicle dry weight, germination percentage and speed of germination.

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Section: Methodsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

The Effects of Source of Priming and Post-priming Storage Duration on Seed Germination and Seedling Growth Characteristics in Wheat (Triticum aestivem L.)

Abnavi¹,

Ghobadi²

2012

JAS

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show abstract

“…The results suggested that BRs directly enhance stomatal opening in rice leaves. This phenomenon indirectly led to alleviated heat stress because the regulation of stomatal conductance is the main process that plants use to control the temperature in their leaves (Pospíšilová 2003). Therefore, the increase in the levels of G s and E by treatment with BRs initiated a reduction in the leaf temperature (Janeczko and others 2011).…”

Section: Discussionmentioning

confidence: 99%

Comparative Effects of Brassinosteroid and Brassinosteroid Mimic on Improving Photosynthesis, Lipid Peroxidation, and Rice Seed Set under Heat Stress

Thussagunpanit

Jutamanee

Kaveeta

et al. 2014

J Plant Growth Regul

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The application of brassinosteroids (BRs) has been reported to alleviate heat stress. This study investigated the effect of 7,8-dihydro-8a-20-hydroxyecdysone (DHECD)-a BR mimic-by comparison with 24-epibrassinolide (EBR) on the changes in photosynthetic performance, lipid peroxidation, and rice seed set. The results demonstrated that 10 28 M EBR and 10 27 M DHECD had the best actions to counteract the lethal heat temperature of 47°C for 2 h indicated by a reduction in the number of wilted leaves and an increase in the relative water content and leaf greenness. Moreover, plants treated with EBR or DHECD were exposed to high day/night temperatures of 40/30°C for 7 days. EBR-treated and DHECD-treated plants showed a high shoot fresh weight, leaf area, chlorophyll content, and carotenoid content. High temperature significantly decreased the leaf net CO 2 assimilation rate as well as increased lipid peroxidation. The application of EBR and DHECD maintained the high level of the net CO 2 assimilation rate by increasing the stomatal conductance and photochemical quenching. On the other hand, EBR and DHECD decreased the intracellular CO 2 content and nonphotochemical quenching leading to enhance photosynthesis under heat stress. EBR-treated and DHECD-treated plants significantly reduced their malondialdehyde and hydrogen peroxide contents as well as increasing their total soluble sugar contents. Moreover, BR treatments increased the filled seed of rice. This study confirmed that DHECDa BR mimic-has activities of heat stress alleviation similar to EBR.

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“…Against theses stresses CKs may help the plants to resist. Thus, several studies show beneficial effects of an increase in CKs levels associated with the stomatal conductance, transpiration and photosynthesis under water stress [74]. In addition, a decrease in CKs levels and signaling suppression was found in alfalfa under drought [75] but it was accompanied with accelerated senescence (Figure 2).…”

Section: Effect Of Ck On Plant Growth Responses Under Drought and Salmentioning

confidence: 94%

Alterations of Endogenous Hormonal Levels in Plants under Drought and Salinity

Llanes¹,

Andrade²,

Alemano³

et al. 2016

AJPS

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The phytohormones are pivotal chemical messengers produced within the plant that regulate its growth and development, and responses to environmental stimuli. Drought and salinity are adverse environmental factors that disturb the plant hormonal balance. Accordingly, these hormonal fluctuations modify the cellular dynamic and hence they play a central role in regulating plant growth responses to abiotic stresses such as drought and salinity. The present review gives an update about the alterations of endogenous phytohormones such as abscisic acid (ABA), auxins (Aux), cytokinins (CKs), ethylene (ET), gibberellins (GAs), jasmonates (JAs), salicylic acid (SA), brassinosteroids (BRs), strigolactones (SLs) and nitric oxide (NO) that occur as part of the adaptative responses of plant against drought and salt stresses. Better understanding of the endogenous hormonal changes during the plant response to both abiotic stresses will contribute, in part, to the development of stress-tolerant plants.

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Participation of Phytohormones in the Stomatal Regulation of Gas Exchange During Water Stress

Cited by 160 publications

References 191 publications

The Effects of Source of Priming and Post-priming Storage Duration on Seed Germination and Seedling Growth Characteristics in Wheat (Triticum aestivem L.)

The Effects of Source of Priming and Post-priming Storage Duration on Seed Germination and Seedling Growth Characteristics in Wheat (Triticum aestivem L.)

Comparative Effects of Brassinosteroid and Brassinosteroid Mimic on Improving Photosynthesis, Lipid Peroxidation, and Rice Seed Set under Heat Stress

Alterations of Endogenous Hormonal Levels in Plants under Drought and Salinity

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