Levels of abscisic acid in anoxia- or ethylene-treated rice (Oryza sativa L.) seedlings

Lee, Tse‐Min; Lur, Huu‐Sheng; Shieh, Yuh-Jang; Cai, Chun

doi:10.1016/0168-9452(94)90086-8

Cited by 14 publications

(9 citation statements)

References 31 publications

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“…Additionally, when the fiber achieved maximum rate of dry matter accumulation (on day 30), the free ABA content was relatively low and increased with the decrease in the rate of dry matter accumulation. An inverse relationship between internal ABA levels and cell elongation in roots and coleoptiles of rice has been reported (Lee et al 1994). A negative correlation between ABA levels in the elongation zone of maize root and the growth rate of the root has also been reported (Pilet and Saugy 1987).…”

Section: Resultsmentioning

confidence: 91%

Potential Role of Abscisic Acid in Cotton Fiber and Ovule Development

Gokani

Kumar

Thaker

1998

J Plant Growth Regul

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Fibers and ovules of a cotton cultivar (Gossypium hirsutum L. Trambak-108) were analyzed for growth and free abscisic acid (ABA) content by indirect enzyme immunoassay. An inverse correlation between fiber elongation and ABA content was observed. In the seed, accumulation of ABA was observed during secondary thickening and the maturation phase. The potential role of ABA in fiber and seed development is discussed.

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Section: Resultsmentioning

confidence: 91%

Potential Role of Abscisic Acid in Cotton Fiber and Ovule Development

Gokani

Kumar

Thaker

1998

J Plant Growth Regul

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“…In a feedback control manner, ethylene could decrease ABA accumulation in the shoots/coleoptiles ( Figure 4A) to release the inhibitory roles of ABA ( Figure 9B). ABA is also an inhibitory modulator of the ethylene-induced morphological changes of etiolated rice seedlings (Lee et al, 1994;Nambara and Marion-Poll, 2005).…”

Section: The Role Of Mhz5 In the Ethylene Regulation Of Rice Coleoptimentioning

confidence: 99%

Ethylene Responses in Rice Roots and Coleoptiles Are Differentially Regulated by a Carotenoid Isomerase-Mediated Abscisic Acid Pathway

et al. 2015

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Ethylene and abscisic acid (ABA) act synergistically or antagonistically to regulate plant growth and development. ABA is derived from the carotenoid biosynthesis pathway. Here, we analyzed the interplay among ethylene, carotenoid biogenesis, and ABA in rice (Oryza sativa) using the rice ethylene response mutant mhz5, which displays a reduced ethylene response in roots but an enhanced ethylene response in coleoptiles. We found that MHZ5 encodes a carotenoid isomerase and that the mutation in mhz5 blocks carotenoid biosynthesis, reduces ABA accumulation, and promotes ethylene production in etiolated seedlings. ABA can largely rescue the ethylene response of the mhz5 mutant. Ethylene induces MHZ5 expression, the production of neoxanthin, an ABA biosynthesis precursor, and ABA accumulation in roots. MHZ5 overexpression results in enhanced ethylene sensitivity in roots and reduced ethylene sensitivity in coleoptiles. Mutation or overexpression of MHZ5 also alters the expression of ethylene-responsive genes. Genetic studies revealed that the MHZ5-mediated ABA pathway acts downstream of ethylene signaling to inhibit root growth. The MHZ5-mediated ABA pathway likely acts upstream but negatively regulates ethylene signaling to control coleoptile growth. Our study reveals novel interactions among ethylene, carotenogenesis, and ABA and provides insight into improvements in agronomic traits and adaptive growth through the manipulation of these pathways in rice.

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“…In deep water dee, accelerated cell elongation occurs at the intemodes when young shoots are partially submerged, as a result of hypoxia stimulating ACC synthase activity in the intercalary medstems, Ethyiene appears to make cells more sensitive to GAs thereby favoring cell expansion. Expansion may also be favored by a lowedng of ABA levels dudng partial submergence (Azuma et al, 1995, Hoffman-Benning andKende 1992), Ethyiene accumulation also accelerated elongation of rice coleoptiles, but not roots or leaves, in association with ABA levels (Lee et al, 1994), In dee, ACC synthase is encoded by a multigene fatnily, comprising at least five member (Zarembinski and Theologis 1993), The genes are expressed tinder hypoxic condition, but are tissue or organ specific with different genes induced in the shoot and roots.…”

Section: Hypoxiamentioning

confidence: 99%