Open AccessJournal Article
Endogenous cytokinin levels during early fruit development of macadamia
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TLDR
The timing of endogenous cytokinin accumulation coincides with the period of maximum endosperm volume in macadamia which, along with the predominance of zeatin andZeatin riboside, conforms to the general pattern of accumulation in developing fruits of many other plants.Abstract:
Cytokinins play a central role in fruit set and development, with many plants accumulating high concentrations of endogenous cytokinins in developing fruits, and applied cytokinins being used to induce fruit set or parthenocarpic fruit development. Cytokinin application to flowers or immature fruit of macadamia increases initial fruit set and delays fruit abscission, without affecting final fruit set. This study quantified and determined the timing of endogenous cytokinin accumulation in macadamia flowers and immature fruit, to assist in developing a cytokinin treatment to improve fruit set and kernel quality. Flowers and very young fruit contained little cytokinin but levels rose greatly between 3 and 10 weeks after anthesis. Zeatin and zeatin riboside were the predominant cytokinins at 10 weeks postanthesis, with zeatin riboside concentrations being 20 - 230 times higher than concentrations detected immediately after anthesis. Cytokinin accumulation coincides with the period of maximum endosperm volume in macadamia which, along with the predominance of zeatin and zeatin riboside, conforms to the general pattern of accumulation in developing fruits of many other plants. The very high cytokinin concentrations at this stage may explain the inability of pre- or post-anthesis cytokinin applications to increase fruit retention of macadamia beyond 10 weeks post-anthesis.read more
Citations
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Journal ArticleDOI
Cytokinin-induced parthenocarpic fruit development in tomato is partly dependent on enhanced gibberellin and auxin biosynthesis.
TL;DR: It is shown that parthenocarpic fruit could be induced by 1-(2-chloro-4-pyridyl)-3-phenylurea (CPPU, an active CK) in tomato and suggested that CKs may induce parthenOCarpy in tomato partially through modulation of GA and IAA metabolisms.
Journal ArticleDOI
The reproductive biology of macadamia
TL;DR: This review summarises over 75 years of research on floral induction, floral structure, pollen transfer, the breeding system and fruit development of macadamia, highlighting features such as insect pollination and partial self-incompatibility that limit orchard productivity and affect kernel quality.
Journal ArticleDOI
The Use of Auxin Quantification for Understanding Clonal Tree Propagation
Carlos André Stuepp,Ivar Wendling,Stephen J. Trueman,Henrique Soares Koehler,Katia Christina Zuffellato-Ribas +4 more
TL;DR: The extraction, purification, and quantification of auxins and the application of these techniques in developing improved methods for the clonal propagation of forestry trees are explored.
Journal ArticleDOI
Effect of CPPU on Carbohydrate and Endogenous Hormone Levels in Young Macadamia Fruit.
Zeng Hui,Yang Weihai,Lu Chaozhong,Wenqiu Lin,Zou Minghong,Zhang Hanzhou,Wan Jifeng,Xu-Ming Huang +7 more
TL;DR: Investigation of the effect of CPPU treatment at early fruit development via foliar spray or raceme soaking at 20 mg·L-1 on fruit set and related physiology in macadamia suggested that CPPU promoted carbohydrate mobilization from the leaves to the fruit.
Journal ArticleDOI
Proteomic insight into fruit set of cucumber ( Cucumis sativus L.) suggests the cues of hormone-independent parthenocarpy
Ji Li,Jian Xu,Qinwei Guo,Zhe Wu,Ting Zhang,Kaijing Zhang,Chunyan Cheng,Pin-yu Zhu,Qunfeng Lou,Jinfeng Chen +9 more
TL;DR: The global molecular regulation of fruit development in cucumber was revealed at the protein level and it was suggested that hormone-independent parthenocarpy is regulated by hormone-insensitive proteins such as the NP-specialized proteins.
References
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Book ChapterDOI
The Role of Hormones During Seed Development
TL;DR: The formation of a seed in the life cycle of higher plants is a unique adaptation that incorporates embryo development with various physiological processes that insure the survival of the plant in the next generation.
Book ChapterDOI
The Role of Hormones in Photosynthate Partitioning and Seed Filling
TL;DR: In this article, the involvement of plant hormones as natural regulators of partitioning of photoassimilates especially to developing seeds is discussed, and it is shown that endogenous plant hormones may serve as modulators of many of the specific rate limiting components.
Journal ArticleDOI
Hormonal Interactions in Fruit Development
TL;DR: In this paper, the authors review selected studies that show the interplay between hormones during fruit development, with an emphasis on the interaction between auxin and gibberellin in pea fruit development.
Journal ArticleDOI
Genetic Analysis of Growth-Regulator-Induced Parthenocarpy in Arabidopsis
TL;DR: A number of independent and possibly redundant pathways can direct hormone-induced parthenocarpy, and that endogenous gibberellins play a role in regulating cell expansion and promoting cell division in carpels.
Journal ArticleDOI
The Forms and Sources of Cytokinins in Developing White Lupine Seeds and Fruits
TL;DR: New questions are posed about the localization and timing of CK synthesis, the significance of translocation, and the role(s) of CK forms in reproductive development as well as synthesis in situ.
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