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Chitinase production in pine callus (Pinus sylvestris L.): a defense reaction against endophytes?

Abstract：

:In shoot tip-derived tissue cultures of Scots pine (Pinus sylvestris L.), browning and subsequent degeneration of the culture is accompanied by lipid peroxidation and lignification of cells, which are characteristic features of a plant defense reaction. Since chitinases are enzymes acting primarily in plant defense, their expression was studied in pine callus in order to elucidate the defense reaction. Chitinases were present diversely in tissue cultures originating from shoot tips and embryos of P. sylvestris, in contrast to Pinus nigra embryogenic callus, where production of chitinases or browning was not detected. Because endophytic microbes had earlier been detected in buds of Scots pine, their subsequent presence in the tissue cultures was considered a potential cause of the defense reaction. Therefore, the presence of endophytes in the tissue cultures was examined by in situ hybridization. Endophytes were found to colonize heavily in 45% of the tissue cultures of P. sylvestris and to form biofilms, while the P. nigra callus was not found to contain any microbes. The endophytes seemed to propagate uncontrollably once a tissue culture of P. sylvestris was initiated. Regardless of the high level of chitinase production in the callus, the control of the endophytes presumably becomes inadequate during the tissue culture of P. sylvestris.

journal_name

Planta

journal_title

Planta

authors

Pirttilä AM,Laukkanen H,Hohtola A

doi

10.1007/s00425-001-0709-x

subject

Has Abstract

pub_date

2002-04-01 00:00:00

pages

848-52

issue

6

eissn

0032-0935

issn

1432-2048

journal_volume

214

pub_type

杂志文章

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