Auxin and defoliation effects on photosynthesis and ethylene evolution in mustard

Khan, Nafees A.; Khan, Mohd Shahanbaj; Ansari, Hena A; Samiullah, -

doi:10.1016/s0304-4238(02)00094-8

Cited by 31 publications

(23 citation statements)

References 22 publications

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“…Defoliation of a very young seedling may trigger different compensatory mechanisms, including an increase in photosynthetic activity in the remaining leaves (Mabry and Wayne 1997 ), foliage increase (Khan et al 2002 ), and increase in mineral nutrient uptake (Ruess 1984 ), which, in turn, may cause better plant growth (McNaughton 1983 ). However, numerous papers report a negative effect of defoliation on seedling survival (e.g., von Schütt 1973 ; Myers 1981 ; Wilkinson and Nielsen 1995 ; Muro et al 1998 ; Li and Ma 2003 ).…”

Section: Discussionmentioning

confidence: 99%

Interactive effects of juvenile defoliation, light conditions, and interspecific competition on growth and ectomycorrhizal colonization of Fagus sylvatica and Pinus sylvestris seedlings

2015

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Seedlings of forest tree species are exposed to a number of abiotic (organ loss or damage, light shortage) and biotic (interspecific competition) stress factors, which may lead to an inhibition of growth and reproduction and, eventually, to plant death. Growth of the host and its mycorrhizal symbiont is often closely linked, and hence, host damage may negatively affect the symbiont. We designed a pot experiment to study the response of light-demanding Pinus sylvestris and shade-tolerant Fagus sylvatica seedlings to a set of abiotic and biotic stresses and subsequent effects on ectomycorrhizal (ECM) root tip colonization, seedling biomass, and leaf nitrogen content. The light regime had a more pronounced effect on ECM colonization than did juvenile damage. The interspecific competition resulted in higher ECM root tip abundance for Pinus, but this effect was insignificant in Fagus. Low light and interspecific competition resulted in lower seedling biomass compared to high light, and the effect of the latter was partially masked by high light. Leaf nitrogen responded differently in Fagus and Pinus when they grew in interspecific competition. Our results indicated that for both light-demanding (Pinus) and shade-tolerant (Fagus) species, the light environment was a major factor affecting seedling growth and ECM root tip abundance. The light conditions favorable for the growth of seedlings may to some extent compensate for the harmful effects of juvenile organ loss or damage and interspecific competition.

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Section: Discussionmentioning

confidence: 99%

Interactive effects of juvenile defoliation, light conditions, and interspecific competition on growth and ectomycorrhizal colonization of Fagus sylvatica and Pinus sylvestris seedlings

2015

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“…Ethylene evolution was measured by cutting leaf material into small pieces that were placed in 30‐ml tubes containing moist paper to minimise evaporation from the tissue, as described earlier (Khan et al . 2002).…”

Section: Methodsmentioning

confidence: 99%

“…Ethylene evolution was measured by cutting leaf material into small pieces that were placed in 30-ml tubes containing moist paper to minimise evaporation from the tissue, as described earlier (Khan et al 2002). A 1-ml gas sample from the tubes was withdrawn with a hypodermic syringe and assayed on a gas chromatograph (Nucon 5700, New Delhi, India) equipped with a 1.8-m Porapack N (80-100 mesh) column, a flame ionisation detector and an integrator.…”

Section: Ethylene Evolutionmentioning

confidence: 99%

The application of ethephon (an ethylene releaser) increases growth, photosynthesis and nitrogen accumulation in mustard (Brassica juncea L.) under high nitrogen levels

et al. 2008

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Ethephon (2-chloroethyl phosphonic acid), an ethylene-releasing compound, influences growth and photosynthesis of mustard (Brassica juncea L. Czern & Coss.). We show the effect of nitrogen availability on ethylene evolution and how this affects growth, photosynthesis and nitrogen accumulation. Ethylene evolution in the control with low N (100 mg N kg(-1) soil) was two-times higher than with high N (200 mg N kg(-1) soil). The application of 100-400 microl x l(-1) ethephon post-flowering, i.e. 60 days after sowing, on plants receiving low or high N further increased ethylene evolution. Leaf area, relative growth rate (RGR), photosynthesis, leaf nitrate reductase (NR) activity and leaf N reached a maximum with application of 200 microl x l(-1) ethephon and high N. The results suggest that the application of ethephon influences growth, photosynthesis and N accumulation, depending on the amount of nitrogen in the soil.

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“…Aldesuquy (2000) reported an increase in the number and surface of barley (Hordeum) leaf blades after application of auxin (indole-3acetic acid). Khan et al (2002) using auxin solution of 100 mg kg −1 in the form of indole-3-butyric acid (IBA) and naphthalene-acetic acid (NAA) on Lilium and Pal and Das (1990) on cabbage (Brassica oleracea) both recorded the growth of leaf surface and number in relation to the control.…”

Section: The Number Of Leaves Stems and Inflorescencesmentioning

confidence: 99%

The effects of indole-3-butyric acid and 6-benzyloaminopuryn on Fabaceae plants morphometrics

Sosnowski

Król

Truba

2019

Journal of Plant Interactions

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The experiment was conducted to study the impact of indole-3-butyric acid (synthetic auxin) and 6-benzyloaminopuryn (synthetic cytokinin), and the mixture of these compounds on fresh and dry matter production and the number of leaves, stems, and inflorescences Medicago x varia T. Martyn and Trifolium pratense L. For the plants to be thoroughly covered, 0.2 dm 3 of spraying liquid was used per one cylinder with growth regulator concentration of 30 mg dm −3. Synthetic auxin in the form of IBA, cytokinin in the form of BAP, and their mixture significantly affected biometric parameters of hybrid alfalfa and red clover. However, auxin was more effective than cytokinin. Plants treated with it had more leaves, stems, and inflorescences, which caused an increase in fresh and dry matter weight. Hybrid alfalfa produced more fresh and dry matter than red clover. Plants of the first harvest had the highest values of most biometric features.

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Auxin and defoliation effects on photosynthesis and ethylene evolution in mustard

Cited by 31 publications

References 22 publications

Interactive effects of juvenile defoliation, light conditions, and interspecific competition on growth and ectomycorrhizal colonization of Fagus sylvatica and Pinus sylvestris seedlings

Interactive effects of juvenile defoliation, light conditions, and interspecific competition on growth and ectomycorrhizal colonization of Fagus sylvatica and Pinus sylvestris seedlings

The application of ethephon (an ethylene releaser) increases growth, photosynthesis and nitrogen accumulation in mustard (Brassica juncea L.) under high nitrogen levels

The effects of indole-3-butyric acid and 6-benzyloaminopuryn on Fabaceae plants morphometrics

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