THE INHIBITION OF BRUSSELS SPROUT LEAF SENESCENCE BY KININS

1967 ◽  
Vol 45 (7) ◽  
pp. 1019-1024 ◽  
Author(s):  
D. T. Dennis ◽  
M. Stubbs ◽  
T. P. Coultate
Keyword(s):  
Electron Microscopy ◽  
Plant Growth ◽  
Plant Growth Regulators ◽  
Leaf Senescence ◽  
Growth Regulators ◽  
Brussels Sprout ◽  
Cell Organelles ◽  
Leaf Discs ◽  
Mature Leaves ◽  
Young Leaves

The senescence of leaf discs cut from mature Brussels sprout leaves is retarded by a number of kinins. Other plant growth regulators are without effect. When young expanding leaves are treated with kinins the senescence processes appear to be accelerated. The effect of N-6-benzyladenine on the structure of the cell organelles in young and old leaves has been studied by electron microscopy. It has been found that in mature leaves the chloroplast is the organelle which senesces first and the breakdown is retarded by N-6-benzyladenine. The mitochondria are very stable. In young leaves N-6-benzyladenine appears to over-stimulate the chloroplast, causing enlargement and excessive membrane synthesis.

Plant Growth Regulators and Induction of Leaf Senescence in Nitrogen-Deprived Wheat Plants

2007 ◽  
Vol 26 (4) ◽  
pp. 301-307 ◽  
Author(s):  
M. Victoria Criado ◽  
Irma N. Roberts ◽  
Mariela Echeverria ◽  
Atilio J. Barneix
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Leaf Senescence ◽  
Growth Regulators

scholarly journals Plant Growth Regulators Affecting Leaf Traits of Loquat Seedling

2020 ◽  
pp. 73-85
Author(s):  
Muhammad Imam Surya ◽  
Lily Ismaini ◽  
Suluh Normasiwi ◽  
Dwinda Mariska Putri ◽  
Vandra Kurniawan
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Growth And Development ◽  
Leaf Growth ◽  
Leaf Traits ◽  
Naphthalene Acetic Acid ◽  
General View ◽  
Stomata Size ◽  
Young Leaves

Leaf is a key functional traits that shows respond of changes in plant physiology. This experiment aimed to study the changes on the leaf traits of loquat seedling that treated with plant growth regulators (PGRs). Three types of PGRs, auxin (naphthalene acetic acid/NAA), gibberellin (gibberellic acid/GA3) and cytokinin (benzylaminopurine/BA) with four doses (0, 25, 50, 100 ppm) were sprayed onto the leaves of loquat seedling. We observed nine parameters, PGRs treatments were significantly affecting eight parameters, while there were one parameter is not significantly affected. The results showed that either in mature or young leaves, PGRs treatments were significantly affecting in eight parameters the growth and development of leaves, such as leaf surface area, specific leaf area, fresh and dry weight leaf, water content, number of stomata, size of stomata, chlorophyll and transpiration rate compared to control. These results gave general view that PGRs treatment might stimulate leaf growth and development including photosynthesis and respiration. However, PGRs was not significantly affecting the number of stomata in young leaves. The application of PGRs doses was not always inline with the mean value of each parameters and it could be linear or quadratic models. The findings of this research could provide the recommendation for application of PGRs during seedling growth, and theoretical basis for comparison between mature and young leaves after PGRs application.

scholarly journals Exogenous Applications of Benzyladenine and Gibberellic Acid Inhibit Lower-leaf Senescence of Geraniums during Propagation

HortScience ◽  
2013 ◽  
Vol 48 (11) ◽  
pp. 1352-1357 ◽  
Author(s):  
Christopher J. Currey ◽  
Roberto G. Lopez ◽  
Vijay K. Rapaka ◽  
James E. Faust ◽  
Erik S. Runkle
Keyword(s):  
Plant Growth ◽  
Gibberellic Acid ◽  
Plant Growth Regulators ◽  
Leaf Senescence ◽  
Growth Regulators ◽  
Storage Period ◽  
Rooted Cuttings ◽  
Leaf Yellowing ◽  
Spray Applications

After postharvest shipping, the lower leaves of zonal geranium (Pelargonium ×hortorum) cuttings often turn chlorotic and necrotic during rooting in a propagation environment. Our objective was to quantify the efficacy of spray applications of the plant growth regulators (PGRs) benzyladenine (BA) and/or gibberellic acid (GA) at various stages in propagation to reduce lower-leaf senescence and evaluate effects on subsequent rooting. In Expt. 1, cuttings of ‘Patriot White’ geraniums were harvested and treated with BA (2.5 or 5.0 mg·L−1), BA + GA4+7 (2.5 or 5.0 mg·L−1 each), or GA3 (0.5 or 2.0 mg·L−1) either before or after a 2-day storage period simulating commercial shipping. Post-shipment application of all PGRs eliminated leaf yellowing compared with cuttings treated pre-shipment, but rooting was inhibited. In Expt. 2, the promotion of rooting from a rooting hormone preceding treatment with BA (1.25 to 5.0 mg·L−1), BA+GA4+7 (1.25 to 5.0 mg·L−1 each), or GA3 (0.25 to 2.0 mg·L−1) was evaluated on ‘Patriot White’ geranium cuttings after a 2-day simulated shipping. Applying rooting hormones increased the percentage of fully rooted cuttings treated with BA and/or GA from 16.4% to 51.8%. In Expt. 3, cuttings of different geranium cultivars from a commercial producer varied in susceptibility and suppression of leaf yellowing after BA + GA4+7 applications. We conclude that foliar applications of BA + GA4+7 can suppress lower-leaf senescence and rooting during propagation of some geranium cultivars, and the inhibition of rooting can be at least partially overcome with an application of rooting hormone.

scholarly journals ROLES OF PLANT GROWTH REGULATORS ON ADVENTITIOUS ROOTING OF SOME BANANA GENOTYPES (Musa sp.)

2009 ◽  
Vol 12 (9) ◽  
pp. 23-30
Author(s):  
Huong Thanh Tran ◽  
Viet Trang Bui ◽  
Feng Teng-Yung
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Adventitious Rooting ◽  
Histological Changes ◽  
Apical Shoot ◽  
Musa Sp ◽  
Meristematic Region ◽  
Young Leaves ◽  
Root Primordium

Some of Musa cultivars were used in this study: Cauman (AA), Giahuong (AAA), Su (AAB) and Hot (BB). Auxins (IAA, NAA, or 2,4-D at different concentrations) were used to induce adventitious rooting from explants containing a apical shoot and young leaves. Histological changes in the rooting were analysed under microscope. This process included following stages: activation of cell divisions, initiating of meristematic region, formation of root primordium, and root elongation. Roles of genotypes, plant growth regulators in this adventitious rooting were discussed.

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