Chemical regulation of gas exchange and growth of plants in drying soil in the field

Dodd, Ian C.; Stikić, R.; Davies, W. J.

doi:10.1093/jxb/47.10.1475

Cited by 89 publications

(55 citation statements)

References 124 publications

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“…In response to water deficit, the increased ABA concentrations in stomata are the result of not only synthesis and redistribution of ABA within leaves, but also synthesis and export from roots (Davies and Zhang 1991;Dodd et al 1996). Taken together, our results suggested that ABA may play an important role in regulating Al-resistance of soybean, as for how ABA modulated these processes is in progress.…”

Section: Discussionmentioning

confidence: 55%

The accumulation and transport of abscisic acid insoybean (Glycine max L.) under aluminum stress

et al. 2009

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Abscisic acid (ABA) plays an important role in mediating some biotic and abiotic stresses. In the present study, to better understand the relationship of ABA production and Aluminum (Al)-resistance in plants, Al-resistance genotype (Jiyu70) of soybean was adopted to investigate the accumulation and transport of ABA in plants exposed to Al. Results showed that exogenous application of ABA and ABA synthesis inhibitor-fluridone respectively increased and reduced endogenous ABA content in root apices of soybean, and results in the corresponding reduction and aggravation of Al toxicity. Increasing of either Al concentration (0-50 μM) or treatment duration (0-12 h, 30 μM Al) cause a higher inhibition of root elongation and ABA accumulation in root apices of soybean. Al-induced enhancement of endogenous ABA production not only was in roots but also in leaves, whereas La 3+ (behaves similarly as Al 3+ at the level of cell surface) only increased ABA accumulation in roots. In split-root experiments, Al treatment in two parts of roots (Part A, + Al; Part B, + Al) both decreased root elongation and increased ABA accumulation in root apices of soybean. Whereas when only part A of roots was exposed to Al (Part A, + Al; Part B, -Al), endogenous ABA content in root apices increased in part A but inversely in part B, but root elongation inhibition only was found in part A. Using [ 3 H]-ABA radioisotope technique, it was found that [ 3 H]-ABA can transport at the rate of more than 3.2 cm·min −1 in the whole plants, and this can be accelerated by Al supply. In addition, [ 3 H]-ABA tended to distribute in the root part under Al stress. Together, these results suggest that ABA may play an important role in regulating Al resistance of soybean as an Al-stress signal.

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Section: Discussionmentioning

confidence: 55%

The accumulation and transport of abscisic acid insoybean (Glycine max L.) under aluminum stress

et al. 2009

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“…Thus, our results are consistent with previous studies showing that ABA plays a critical role in the negative regulation of stomata (Dodd, 2003) and has a predictable negative relationship with g s (Duan et al, 2007). However, modes of stomatal behavior are too complex to be explained by ABA alone (Liang and Zhang, 1999), and the sensitivity of stomata to ABA varies considerably according to environmental factors, such as temperature, leaf water potential and atmospheric [CO 2 ], ionic composition of epidermal strip, incubation solutions and the presence of other hormones (Dodd et al, 1996). These results may well explain why the D + ABA treatment under HL shows greater , drought effect; P (S) , shade effect; P (ABA) , ABA effect; P (D×S) , drought × shade interaction effect; P (D×ABA) , drought × ABA interaction effect; P (S×ABA) , shade × ABA interaction effect; P (D×S×ABA) , drought × shade × ABA interaction effect.…”

Section: Discussionmentioning

confidence: 99%

Effect of drought and ABA on growth, photosynthesis and antioxidant system of Cotinus coggygria seedlings under two different light conditions

Zhao

Duan

et al. 2011

Environmental and Experimental Botany

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“…Although it is essential to measure cytokinin content at the site of action (the bud), this tissue may not be the most sensitive indicator of changes in plant CK status. By analogy, soil-drying-induced changes in abscisic acid concentrations are detected earlier in the xylem sap than in the bulk leaf (Dodd et al 1996). The bud tissue we analysed all participated in the growth response but consisted of several cell types.…”

Section: Discussionmentioning

confidence: 99%

Rapid increases in cytokinin concentration in lateral buds of chickpea ( Cicer arietinum L.) during release of apical dominance

Turnbull

Raymond

Dodd

et al. 1997

Planta

104

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We examined the role of cytokinins (CKs) in release of apical dominance in lateral buds of chickpea (Cicer arietinum L.). Shoot decapitation or application of CKs (benzyladenine, zeatin or dihydrozeatin) stimulated rapid bud growth. Time-lapse video recording revealed growth initiation within 2 h of application of 200 pmol benzyladenine or within 3 h of decapitation. Endogenous CK content in buds changed little in the ®rst 2 h after shoot decapitation, but signi®cantly increased by 6 h, somewhat later than the initiation of bud growth. The main elevated CK was zeatin riboside, whose content per bud increased 7-fold by 6 h and 25-fold by 24 h. Lesser changes were found in amounts of zeatin and isopentenyl adenine CKs. We have yet to distinguish whether these CKs are imported from the roots via the xylem stream or are synthesised in situ in the buds, but CKs may be part of an endogenous signal involved in lateral bud growth stimulation following shoot decapitation. To our knowledge, this is the ®rst detailed report of CK levels in buds themselves during release of apical dominance.Abbreviations: BA = N 6 -benzyladenine; CK = cytokinin; cv = cultivar; DHZ = dihydrozeatin; IP = isopentenyl adenine; IPA = isopentenyl adenosine; Z = zeatin; ZR = zeatin riboside

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Chemical regulation of gas exchange and growth of plants in drying soil in the field

Cited by 89 publications

References 124 publications

The accumulation and transport of abscisic acid insoybean (Glycine max L.) under aluminum stress

The accumulation and transport of abscisic acid insoybean (Glycine max L.) under aluminum stress

Effect of drought and ABA on growth, photosynthesis and antioxidant system of Cotinus coggygria seedlings under two different light conditions

Rapid increases in cytokinin concentration in lateral buds of chickpea ( Cicer arietinum L.) during release of apical dominance

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