Abstract：
:The contribution of xanthine dehydrogenase (XDH, EC 1.1.1.204) to fruit size was investigated using the normal and small-fruit variants of Persea americana Mill. cv. 'Hass'. Inhibition of XDH by treatment of normal fruit, in the linear phase of growth (phase II), with allopurinol (Allo) arrested fruit growth. Adenine (Ade), a less effective inhibitor of this enzyme, also arrested fruit growth when applied in phase II and slowed fruit growth when applied in phase III. A time-course study on the activity of XDH in mesocarp tissue from normal and small fruit showed that maximum activity occurred late in phase II and that the peak in activity was absent in mesocarp of the small fruit. Feeding Ade to growing fruit in phase III caused a transient decline in fruit growth (measured as change in fruit length). Thereafter, growth resumed although fruit size was irreversibly affected. Treatment of fruit with Ade and Ade-containing cytokinins altered activity of another molybdenum enzyme, aldehyde oxidase (EC 1.2.3.1). Cytokinin oxidase was induced by cytokinin and auxin. Purine catabolism via hypoxanthine/xanthine was operative in normal fruit and in mesocarp from the small-fruit variant and as expected, Allo treatment caused accumulation of xanthine and adenine. In the absence of an increase in XDH during growth of the small-fruit phenotype, low levels of Ade were interpreted as resulting from respiration-enhanced adenylate depletion. Stress and/or pathogen induction of the alternative oxidase pathway is proposed as a possible cause.
journal_name
J Plant Resjournal_title
Journal of plant researchauthors
Taylor NJ,Cowan AKdoi
10.1007/s10265-003-0136-0subject
Has Abstractpub_date
2004-04-01 00:00:00pages
121-30issue
2eissn
0918-9440issn
1618-0860journal_volume
117pub_type
杂志文章abstract：:Pristine tropical rainforests in Southeast Asia have rich species diversity and are important habitats for many plant species. However, the extent of these forests has declined in recent decades and they have become fragmented due to human activities. These developments may reduce the genetic diversity of species with...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-007-0078-z
更新日期：2007-05-01 00:00:00
abstract：:Reduction of pollen flow can affect plant abundance and population viability and cause selection on plant mating system and floral traits. Little is known on the effect of this phenomenon in species naturally restricted to small and isolated habitats, that may have developed strategies to cope with long-term isolation...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-013-0588-9
更新日期：2014-01-01 00:00:00
abstract：:Recent progress in the study of cytokinin metabolism in plants indicates that quantitative analysis of cytokinin nucleotides is essential for elucidation of early steps of the biosynthetic pathway. However, traditional procedures for purification and quantification of cytokinin cannot discriminate the various nucleoti...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-003-0099-1
更新日期：2003-06-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/pl00013907
更新日期：1999-12-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-014-0661-z
更新日期：2014-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-016-0812-5
更新日期：2016-07-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-008-0170-z
更新日期：2008-09-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-008-0191-7
更新日期：2009-01-01 00:00:00
abstract：:Rehmannia japonica (Thunb.) Makino ex T. Yamaz. is an endangered perennial herb species in Japan. Although earlier the Japanese considered it a variety of R. glutinosa, recent Japanese taxonomists have consistently regarded it as an independent species. According to the historical literature, Rehmannia japonica seems ...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-016-0873-5
更新日期：2017-01-01 00:00:00
abstract：:The pollen morphology of two species of the Neotropical genus Ceratostema (Ericaceae) was examined by light, scanning and transmission electron microscopy. The Ceratostema species examined have 3-colporate pollen grains united in permanent tetrahedral tetrads that show a common condition encountered in the Ericaceae. ...
journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-006-0029-0
更新日期：2006-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-016-0903-3
更新日期：2017-03-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-015-0735-6
更新日期：2015-09-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章,评审
doi：10.1007/s10265-009-0267-z
更新日期：2010-01-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-006-0035-2
更新日期：2007-03-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章,评审
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更新日期：2017-05-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-005-0206-6
更新日期：2005-06-01 00:00:00
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journal_title：Journal of plant research
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doi：10.1007/s10265-015-0745-4
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journal_title：Journal of plant research
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doi：10.1007/s10265-010-0320-y
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journal_title：Journal of plant research
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更新日期：2009-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-007-0129-5
更新日期：2008-01-01 00:00:00
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journal_title：Journal of plant research
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更新日期：2020-11-01 00:00:00
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journal_title：Journal of plant research
pub_type： 杂志文章
doi：10.1007/s10265-009-0245-5
更新日期：2009-09-01 00:00:00
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journal_title：Journal of plant research
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doi：10.1007/s10265-006-0056-x
更新日期：2007-03-01 00:00:00
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更新日期：2009-01-01 00:00:00
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pub_type： 杂志文章
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journal_title：Journal of plant research
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更新日期：2010-11-01 00:00:00
