The relationship between chlorophyll accumulation and endogenous cytokinin in the greening cotyledons of Pinus nigra Arn

Jelić, Gordana; Bogdanovic, M.

doi:10.1016/0168-9452(90)90003-7

Cited by 11 publications

(1 citation statement)

References 13 publications

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“…from day 1 to 30 of cultivation. The values represent the mean of the five replications and the bars stand for SE Plant Growth Regul (2011) 65:427-437 433 supplementation of CKs (Jelic and Bogdanovic 1990). However, our analyses revealed extremely low levels of endogenous CKs in the initial plant material.…”

Section: Discussionmentioning

confidence: 91%

Changes in cytokinin levels and metabolism in tobacco (Nicotiana tabacum L.) explants during in vitro shoot organogenesis induced by trans-zeatin and dihydrozeatin

et al. 2011

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The uptake and metabolism of trans-zeatin and/or dihydrozeatin, in correlation with cytokinin oxidase/ dehydrogenase (CKX) and b-glucosidase activity, were studied in leaf segments derived from wild-type (WT) and transgenic (T) tobacco (Nicotiana tabacum L. cv. Petit Havana SR1) during in vitro induction of shoot organogenesis. T explants harbored the maize gene Zm-p60.1 b-glucosidase. Higher levels of shoot regeneration were observed on T explants in the early stages of cultivation. In WT explants, the content of cytokinin (CK)-O-and N-glucosides increased. In T explants, a higher content of Z-9-riboside and Z-9-riboside-5 0 -monophosphate and higher CKX activity during the early stage of cultures were found. A positive correlation was obtained for bioactive CK content and the organogenic response in T explants.Our results indicate a connection between the organogenic capacity of tobacco explants, metabolism of endogenous CKs and uptake of exogenous CKs from the cultivation medium.

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Section: Discussionmentioning

confidence: 91%

Changes in cytokinin levels and metabolism in tobacco (Nicotiana tabacum L.) explants during in vitro shoot organogenesis induced by trans-zeatin and dihydrozeatin

et al. 2011

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Growth

Sembdner¹,

Herrmann²,

Schliemann³

1992

Progress in Botany

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Light-independent synthesis of LHC IIb polypeptides and assembly of the major pigmented complexes during the initial stages of Pinus palustris seedling development

1993

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Pinus palustris has a greatly reduced need for light to initiate chloroplast development in comparison to angiosperms. Light is not required for chlorophyll synthesis in dark-grown Pinus palustris seedlings. However, embryos do not contain chlorophyll, and synthesis is limited to seedlings having cotyledon lengths between about 0.5 cm and 2.0 cm. The final amount of chlorophyll accumulated by dark-grown seedlings is about one fifth of that in light-grown seedlingsat the same stage. The major light-harvesting chlorophyll a/b-polypeptides of Photosystem II (LHC IIb) are absent in the embryos but begin to accumulate in seedlings of 0.5 cm cotyledon length, irrespective of the light conditions. Although dark-grown seedlings accumulate most of the pigmented complexes seen in light-grown seedlings, there are differences in the subunit structure of some of them. These findings suggest that the majority of the components of the photosynthetic membrane do not require light for induction of synthesis or assembly into complexes, but that the final forms seen in light-grown seedlings may require light.

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The relationship between chlorophyll accumulation and endogenous cytokinin in the greening cotyledons of Pinus nigra Arn

Cited by 11 publications

References 13 publications

Changes in cytokinin levels and metabolism in tobacco (Nicotiana tabacum L.) explants during in vitro shoot organogenesis induced by trans-zeatin and dihydrozeatin

Changes in cytokinin levels and metabolism in tobacco (Nicotiana tabacum L.) explants during in vitro shoot organogenesis induced by trans-zeatin and dihydrozeatin

Growth

Light-independent synthesis of LHC IIb polypeptides and assembly of the major pigmented complexes during the initial stages of Pinus palustris seedling development

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