Fertilization Response on Growth, Photosynthesis, Starch Accumulation, and Leaf Nitrogen Status of<i>Cassia siamea</i>Lam. Seedlings Under Nursery Conditions

Kannan, D.; Paliwal, Kailash

doi:10.1300/j091v04n01_08

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…The lack of phenolic responses by yaupon to nitrogen addition indicates the need for alternatives to the mechanism set forth by the CNB hypothesis for interpretation of these results. Although the CNB hypothesis predicts that carbon allocation to carbon-based secondary metabolism decreases with nitrogen fertilization due to faster rates of growth relative to photosynthesis (Bryant et al 1983), nitrogen fertilization does not necessarily favor growth over photosynthesis (Kannan and Paliwal 1997). Furthermore, even when nitrogen additions stimulate biomass accumulation but not photosynthetic rates, phenolic concentrations do not always decrease (Reichardt et al 1991;Bezemer et al 2000).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen fertilizer and gender effects on the secondary metabolism of yaupon, a caffeine-containing North American holly

2006

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Yaupon (Ilex vomitoria) is a caffeine-containing dioecious shrub native to the southeastern United States that was historically brewed into a stimulating beverage. We tested predictions of the carbon/nutrient balance (CNB) hypothesis by determining whether nitrogen availability and gender influence production of caffeine and related alkaloids as well as phenolic compounds in leaves of pot-grown yaupon plants fertilized with ammonium nitrate. The CNB hypothesis predicts that additional nitrogen should result in increased alkaloid concentrations and decreased phenolic concentrations. An extension of the CNB hypothesis to dioecious plants predicts that females have higher C/N ratios and therefore higher phenolic concentrations and lower alkaloid concentrations than male conspecifics. In our study, caffeine and total alkaloid concentrations were 5-10 times higher in fertilized than control plants but did not vary by gender. Nevertheless, an observed interaction between gender and fertilization suggests that females respond more to fertilization than males in caffeine production. In addition, fertilized plants not only contained higher concentrations of alkaloids and total nitrogen but also allocated a larger proportion of their nitrogen to alkaloid production than control plants. Total phenolic concentrations were higher in control females than control males as predicted by the CNB hypothesis, but did not vary by treatment nor were there differences by gender among fertilized plants. We also found high correlations between antioxidant capacity and both classes of phenolic compounds detected in our study (cinnamic acid derivatives and flavonoids) indicating that in addition to their putative defensive function against herbivores, phenolics protect yaupon from oxidative stress. Explanation of the inconsistencies between our data and predictions of the CNB hypothesis may benefit from a re-appraisal of the physiological mechanisms by which resource availability affects secondary metabolism as well as consideration of the selective pressures to which secondary metabolism responds.

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Section: Discussionmentioning

confidence: 99%

Nitrogen fertilizer and gender effects on the secondary metabolism of yaupon, a caffeine-containing North American holly

2006

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“…On the basis of the topsoil analysis (Table 7) It is unsure that by supplying inorganic nutrients to media or substrates through fertilizer, they will be useful for the wildling growth. Kannan & Paliwal (2008) had studied about the effects of nitrogen, phosphorus, and potash fertilizers on Cassia siamea seedlings under nursery conditions. Kannan & Paliwal (2008) concluded that the effects of nitrogen increased seedling growth, whereas phosphorus or potash fertilizers, either separately or in combination, did not improve seedling growth.…”

Section: Discussionmentioning

confidence: 99%

“…Kannan & Paliwal (2008) had studied about the effects of nitrogen, phosphorus, and potash fertilizers on Cassia siamea seedlings under nursery conditions. Kannan & Paliwal (2008) concluded that the effects of nitrogen increased seedling growth, whereas phosphorus or potash fertilizers, either separately or in combination, did not improve seedling growth. It was concluded that natural chemical properties of soil are very important factors supporting the wildling growth, and therefore findings in the present research showing that the topsoil located close to the base of mother trees is very useful in cultivating trees, especially when utilizing topsoil from the forests as growth media.…”

Section: Discussionmentioning

confidence: 99%

Accelerating the growth of red meranti (Shorea leprosula) wildlings by utilizing better topsoil media from under mother trees and optimum tending duration in a simple greenhouse

2017

Int. J. Biosci.

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Topsoil under mother trees has been being used for substrates or media of growing wildlings in the nursery in the forest, but information about where the positions of the topsoil should be collected from the base of mother trees was not sufficiently studied. The study divided the positions into three parts: the closest, the middle, and the farthest positions from the base of mother trees within the projection of the crown of the mother trees. In addition, wildlings used as seedling stocks usually suffer from stress because of extraction from the original sites and transportation process, so they need tending in a simple greenhouse. The study divided the tending duration into four periods: without tending, two weeks, three weeks, and four weeks. The experimental design used was a factorial 3 × 4 with a randomized complete design. Based on the F-test, the positions of topsoil from mother trees and tending duration in a simple greenhouse separately affected the growth of the wildlings. With the least significant difference level of 5%, the results showed that the topsoil close to the base of mother trees, and tending for 3-4 weeks in the simple greenhouse yielded the best growth for the red meranti (Shorea leprosula) wildlings.

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Fertilization Response on Growth, Photosynthesis, Starch Accumulation, and Leaf Nitrogen Status ofCassia siameaLam. Seedlings Under Nursery Conditions

Cited by 2 publications

References 21 publications

Nitrogen fertilizer and gender effects on the secondary metabolism of yaupon, a caffeine-containing North American holly

Nitrogen fertilizer and gender effects on the secondary metabolism of yaupon, a caffeine-containing North American holly

Accelerating the growth of red meranti (Shorea leprosula) wildlings by utilizing better topsoil media from under mother trees and optimum tending duration in a simple greenhouse

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