当前位置： SCI文献检索 > JOURNAL OF PLANT PHYSIOLOGY期刊下所有文献 > Changes in the ascorbate system in the response of pumpkin (Cucurbita pepo L.) roots to aluminium stress.

Changes in the ascorbate system in the response of pumpkin (Cucurbita pepo L.) roots to aluminium stress.

Abstract：

:The involvement of the ascorbate (AsA) system in the response of pumpkin (Cucurbita pepo L.) roots to aluminium stress was studied. The treatment of 5-day-old pumpkin seedlings with 50 microM aluminium sulphate resulted in approximately 60% inhibition of root growth within 48-60 h of treatment, while aluminium accumulated in the roots reaching a maximum within 48h. During the same period, the hydrogen peroxide content of the roots was strongly enhanced. The increased level of hydrogen peroxide was matched by both increased ascorbate peroxidase (APX) (EC 1.11.1.11) activity and ascorbate free radical reductase (AFRR) (EC 1.1.5.4) activity, while dehydroascorbate reductase (DHAR) (EC 1.8.5.1) and glutathione reductase (GR) (EC 1.6.4.2) did not change. The levels of AsA in the roots were also increased by the Al treatment. It was concluded that an oxidative burst is probably involved in the toxicity of Al in pumpkin roots and that plants react to the enhanced production of reactive oxygen species by expressing higher levels of scavenging systems such as the AsA-APX system.

journal_name

J Plant Physiol

journal_title

Journal of plant physiology

authors

Dipierro N,Mondelli D,Paciolla C,Brunetti G,Dipierro S

doi

10.1016/j.jplph.2004.06.008

subject

Has Abstract

pub_date

2005-05-01 00:00:00

pages

529-36

issue

5

eissn

0176-1617

issn

1618-1328

pii

S0176-1617(04)00147-6

journal_volume

162

pub_type

杂志文章

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