Laticifer Differentiation in Hevea brasiliensis: Induction by Exogenous Jasmonic Acid and Linolenic Acid

Bing-zhong, Hao; Wu, Jang‐Yen

doi:10.1006/anbo.1999.0995

Cited by 146 publications

(162 citation statements)

References 12 publications

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“…Tapping panel phloem of healthy rubber trees of the present study had the same histology as secondary phloem from barks and heveas of varied origin de Faÿ 1981;Hao and Wu 2000;Sando et al 2009). At the ultrastructural level, the tapping panel phloem of mature rubber trees had been little investigated up to now and was not considered as a whole .…”

Section: Discussionmentioning

confidence: 76%

Histo- and cytopathology of trunk phloem necrosis, a form of rubber tree (Hevea brasiliensis Müll. Arg.) tapping panel dryness

Faÿ¹

2011

Aust. J. Bot.

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Abstract. Trunk phloem necrosis (TPN) is a physiological disease of rubber tree (Hevea brasiliensis Müll. Arg.) discovered in the 1980s. It has been distinguished from rubber tree tapping panel dryness (TPD) by its macroscopic symptoms and presumed origin. But little attention has been paid to its microscopic features, and there is now some evidence that both syndromes could be linked to an impaired cyanide metabolism. In order to characterise TPN and compare it with TPD microscopically, the inner phloem of tapping panels was investigated by light and transmission electron microscopy in healthy trees and TPN-affected trees. TPN-affected phloem presented numerous and varied structural and ultrastructural features. There were signs of cellular deterioration in a great number of specialised cells, i.e. laticifers and sieve tubes, and not very specialised cells, i.e. parenchyma cells and companion cells. There were also signs of cellular dedifferentiation in other parenchymatous cells, e.g. in tylosoids and hyperplasic cells. These cells were derived from parenchyma cells that ensheath laticifers in which the latex coagulated. Numerous structural features of TPN are common to TPD, notably tylosoids associated with in situ coagulated latex, which are also known to be early structural markers of TPD and cyanide-induced. It is therefore concluded that TPN is identical to or a variant of TPD, and is a degenerative disease of rubber tree trunk phloem resembling plant stress response, programmed cell death and plant tumourigenesis in some aspects.

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Section: Discussionmentioning

confidence: 76%

Histo- and cytopathology of trunk phloem necrosis, a form of rubber tree (Hevea brasiliensis Müll. Arg.) tapping panel dryness

Faÿ¹

2011

Aust. J. Bot.

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“…bras., Brasília, v.45, n.12, p.1372-1380, dez. 2010 de Faÿ & Jacob, 1989a;Hao & Wu, 2000;Sando et al, 2009). Therefore, the control solution and experimental wounds made for its application had no observable effect, and the applied cyanogenic compounds (linamarin or KCN) did induce the histological changes detected at the occurrence of partial dryness.…”

Section: Resultsmentioning

confidence: 99%

Cyanogenesis and the onset of tapping panel dryness in rubber tree

Faÿ

Moraes

Moraes³

2010

Pesq. agropec. bras.

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-The objective of this work was to study the influence of cyanogenesis on the onset of irreversible tapping panel dryness (TPD) and the physiological and histological aspects of secondary phloem in the trunk (tapping panel) of rubber trees (Hevea spp.). Two cyanogenic compounds, linamarin and KCN, were applied separately on the trunk bark of healthy mature trees belonging to two Brazilian clones (Fx 4098 and Fx 3899). Changes in histology, latex pressure potential (Ψ P ) and cyanogenic potential (HCNp) were followed in the trunk inner barks. In addition, the HCNp levels were determined in TPD-affected plants of both clones. The applications of linamarin or KCN in healthy plants decreased latex Ψ P , and formed tylosoids associated with in situ coagulation of latex. The clone Fx 4098 had the higher HCNp and showed the quicker and stronger responses to the cyanogenic compounds. Plants with TPD syntoms had a higher HCNp than the untreated healthy ones. Since histological changes are also structural markers of early TPD, it can be inferred that excessive release of cyanide can induce it in sensitive rubber clones.Index terms: Hevea, clonal sensitivity, cyanogenic potential, latex pressure potential, linamarin, secondary phloem. Cianogênese e estabelecimento do secamento de painel de sangria em seringueiraResumo -O objetivo deste trabalho foi estudar a influência da cianogênese no estabelecimento do secamento do painel de sangria (TPD) e os aspectos fisiológicos e histológicos do floema secundário do tronco (painel de sangria) em seringueira (Hevea spp.

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“…Elicitors of the processes of secondary metabolism induce JA biosynthesis as an early response, and JA subsequently induces expression of genes that code for the synthesis of enzymes involved in the biosynthetic processes involved in secondary metabolism (Menke et al, 1999;van der Fits and Memelink, 2000). JA can induce laticifer differentiation and may regulate rubber biosynthesis (Hao and Wu, 2000;Wu et al, 2002;Yu et al, 2007;Peng et al, …”

Section: Discussionmentioning

confidence: 99%

“…The selected trees with a girth of 50-55 cm were treated with 0.2% ethephon and 0.1% jasmonic acid (JA), following the Hao method (Hao and Wu, 2000). For latex RNA extraction, rubber trees were tapped using a tapping knife.…”

Section: Plant Materialsmentioning

confidence: 99%

Cloning and molecular characterization of a cDNA encoding a small GTPase from Hevea brasiliensis

Guo²,

Tian³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Small GTPases play a critical role in the regulation of a range of cellular processes including growth, differentiation, and intracellular transportation. The cDNA encoding a small GTPase, designated as HbGTPase1, was isolated from Hevea brasiliensis. HbGTPase1 was 882 bp long containing a 612-bp open reading frame encoding a putative protein of 203 amino acids, flanked by an 83-bp 5'-untranslated region (UTR) and a 187-bp 3'-UTR. The predicted molecular mass of HbGTPase1 is 22.62 kDa, with an isoelectric point of 5.06. The HbGTPase1 protein was predicted to possess the conserved functional regions of the small GTPase superfamily of proteins. Quantitative polymerase chain reaction analysis revealed that HbGTPase1 was constitutively expressed in all tissues tested. HbGTPase1 transcripts accumulated at relatively low levels in the flower, latex, and leaves, while HbGTPase1 transcripts accumulated at relatively high levels in bark. Transcription of HbGTPase1 in the latex was induced by jasmonate.

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Laticifer Differentiation in Hevea brasiliensis: Induction by Exogenous Jasmonic Acid and Linolenic Acid

Cited by 146 publications

References 12 publications

Histo- and cytopathology of trunk phloem necrosis, a form of rubber tree (Hevea brasiliensis Müll. Arg.) tapping panel dryness

Histo- and cytopathology of trunk phloem necrosis, a form of rubber tree (Hevea brasiliensis Müll. Arg.) tapping panel dryness

Cyanogenesis and the onset of tapping panel dryness in rubber tree

Cloning and molecular characterization of a cDNA encoding a small GTPase from Hevea brasiliensis

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