Untersuchungen über Stickstoffverbindungen und Chlorophyll während des V ergilbens derg Laubblätter von Ginkgo biloba

Specht-Jürgensen, Ingrid

doi:10.1016/s0367-1836(17)30058-7

Cited by 2 publications

(2 citation statements)

References 49 publications

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“…2). This result is consistent with those reported by Specht-Jurgensen (1967). Regarding pigments, the most impressive phenomenon concerns the high retention of carotenoids.…”

Section: Pigmentssupporting

confidence: 92%

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Autumn Leaves of Ginkgo biloba L.: Optical Properties, Pigments and Optical Brighteners

1992

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Senescent leaves of Gingko biloba accumulate fluorescent compounds which may contribute to the golden luminous appearance of the autumnal foliage. Apart from the putative effect of such optical brighteners, the changes of spectral optical properties associated with senescence are due to the breakdown of chlorophyll in conjunction with a remarkably high retention of carotenoids. Carotenoid esters accumulate concomitant with chlorophyll breakdown. Optical properties in the infrared range of the spectrum illustrate the intactness ofleaftissue to the end of the senescence period.

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“…2). This result is consistent with those reported by Specht-Jurgensen (1967). Regarding pigments, the most impressive phenomenon concerns the high retention of carotenoids.…”

Section: Pigmentssupporting

confidence: 92%

“…Foliar senescence is associated with degradative processes in the mesophyll which are ultimately aimed at the recycling of nutrient elements. In Ginkgo biloba about two third of protein is broken down and mobile organic nitrogen is withdrawn from the leaves by the end of the autumnal senescence period (Specht-Jurgensen. 1967).…”

Section: Introductionmentioning

confidence: 99%

Autumn Leaves of Ginkgo biloba L.: Optical Properties, Pigments and Optical Brighteners

1992

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Longevity and senescence of needles in Pinus cembra L.

Nebel

Matile

1992

Trees

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Summary. Needle development has been investigated inPinus cembra at several locations in the Grisons. Special attention has been paid to longevity and senescence. Despite large variations from one tree to another, longevity (up to 12 years) appeared to increase with increasing altitude. With increasing age, contents of nutrients such as N, P, K and, to a lesser extent, Mg and S tend to decrease. Photosynthetic activity did not decline with increasing age of short shoots. Senescence begins in mid-August in needles of the oldest age classes. It is associated with the mobilization and withdrawal of large proportions of N, P, K and also Mg and S, but Ca appears to be immobile. The extent of yellowing is irregular in individual trees but needle losses on a large scale are followed by reduced losses in subsequent years.

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Untersuchungen über Stickstoffverbindungen und Chlorophyll während des V ergilbens derg Laubblätter von Ginkgo biloba

Cited by 2 publications

References 49 publications

Autumn Leaves of Ginkgo biloba L.: Optical Properties, Pigments and Optical Brighteners

Autumn Leaves of Ginkgo biloba L.: Optical Properties, Pigments and Optical Brighteners

Longevity and senescence of needles in Pinus cembra L.

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