Effects of Nitrogen and 6‐Benzylaminopurine on Rice Tiller Bud Growth and Changes in Endogenous Hormones and Nitrogen

Liu, Yang; Ding, Yanfeng; Qiangsheng, Wang; Meng, Dexuan; Wang, Shaohua

doi:10.2135/cropsci2010.04.0217

Cited by 70 publications

(55 citation statements)

References 31 publications

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“…1). Our previous study showed that N might regulate tiller bud growth through at least two mechanisms: by regulating N metabolism and endogenous hormone levels (Liu et al 2011c). We focused on the hormone pathway in the present study and found that N could significantly promote the amounts of all forms of endogenous CKs in both tiller buds and nodes (Table 1).…”

Section: Discussionmentioning

confidence: 58%

The interaction between nitrogen availability and auxin, cytokinin, and strigolactone in the control of shoot branching in rice (Oryza sativa L.)

Zha

et al. 2015

Plant Cell Rep

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137

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Nitrogen availability and cytokinin could promote shoot branching in rice, whereas auxin and strigolactone inhibited it. The interaction between nitrogen availability and the three hormones is discussed. Rice shoot branching is strongly affected by nitrogen availability and the plant hormones auxin, cytokinin, and strigolactone; however, the interaction of them in the regulation of rice shoot branching remains a subject of debate. In the present study, nitrogen and the three hormones were used to regulate rice tiller bud growth in the indica rice variety Yangdao 6. Both nitrogen and CK promoted shoot branching in rice, whereas auxin and SL inhibited it. We used HPLC to determine the amounts of endogenous IAA and CK, and we used quantitative real-time PCR analysis to quantify the expression levels of several genes. Nitrogen enhanced the amount of CK by promoting the expression levels of OsIPTs in nodes. In addition, both nitrogen and CK downregulated the expression of genes related to SL synthesis in root and nodes, implying that the inhibition of SL synthesis by nitrogen may occur at least partially through the CK pathway. SL did not significantly reduce the amount of CK or the expression levels of OsIPT genes, but it did significantly reduce the amount of auxin and the auxin transport capacity in nodes. Auxin itself inhibited CK synthesis and promoted SL synthesis in nodes rather than in roots. Furthermore, we found that CK and SL quickly reduced and increased the expression of FC1 in buds, respectively, implying that FC1 might be a common target for the CK and SL pathways. Nitrogen and auxin delayed expression change patterns of FC1, potentially by changing the downstream signals for CK and SL.

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Section: Discussionmentioning

confidence: 58%

The interaction between nitrogen availability and auxin, cytokinin, and strigolactone in the control of shoot branching in rice (Oryza sativa L.)

Zha

et al. 2015

Plant Cell Rep

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137

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“…For instance, N is a critical component of all amino acids, whereas P is a critical component of adenosine triphosphate (ATP). Besides, it has been reported that N fertilizers can directly affect the phytohormones, so that plants fertilized with N had significantly higher level of indole-3-acetic acid (IAA) and gibberellins compared to N-starved plants (Liu et al, 2011;Wiser, 2014).…”

Section: Discussionmentioning

confidence: 99%

The Impacts of Nano-Structured Nutrients on Chickpea Performance under Supplemental Irrigation

Janmohammadi

Sabaghnia

Seifi

et al. 2017

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Chickpea is a legume of the family Fabaceae and the most widely grown crop in the semi-arid Mediterranean regions. This pulse crop can grow on almost any soil and is well adapted to the semi-arid conditions, but for good growth it requires a fertile soil with good residual moisture. Therefore, nutrient-and water-management practices are necessary agronomic options to improve chickpea production. The objective of this study was to evaluate the effect of different conventional and nano-fertilizers on growth and yield of Kabuli chickpea under supplemental irrigation. The experiment was carried out at a research field in dry highland of Maragheh, North western Iran. Plants were grown under rainfed situation during the vegetative growth and supplement irrigations was applied during flowering and seed filling stages. The effect of nine nutrient treatments including T1: control (no fertilizer application), T2: nano-chelated iron, T3: nano-chelated manganese, T4: nano-chelated copper, T5: nano-chelated boron, T6: organic manganese, T7: conventional NPK fertilizer, T8: multi-nutrient nano-fertilizer and T9: nano-chelated zinc were evaluated. Result showed that application of multi-nutrient nano-fertilizer, conventional NPK fertilizer and nano-chelated Zn considerably improved the both vegetative growth (e.g. plant height, canopy width, number of the branches) and yield components. Also the highest chlorophyll concentration (P < 0.05) was recorded for plant grown by application of multi-nutrient / compound fertilizers. There was a significant positive correlation between chlorophyll concentration and seed yield components (P < 0.01). Among the applied micronutrients, plants significantly responded to nano-chelated Zn. Conventional NPK significantly improved the lateral growth (canopy width, ground cover, branches numbers).The results pointed out that the best performance of chickpea could be achievable through utilization of nano-of multi-nutrient fertilizer, with the simultaneous release of micronutrients and macronutrients. The findings provided illustrative information in order to appreciate the importance of balanced crop nutrition in semi-arid Mediterranean region.

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“…Through polar transport, IAA can regulate the synthesis of CTK; in this way, it is able to regulate the growth of lateral buds (Wang et al, 2006). The basal internodes of rice are not elongated, and this structural characteristic may lead to a deficiency in polar transport of IAA in the aboveground organs (Liu et al, 2011). In the tillering stage, the fifth bud was located at the leaf axils of the fifth leaf from the bottom on the main stem.…”

Section: Discussionmentioning

confidence: 99%

The Positional Effects of Auxin and Cytokinin on the Regulation of Rice Tiller Bud Growth

Liu

Ding

et al. 2011

Crop Science

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Auxin and cytokinin (CTK) play important roles In the regulation of rice {Oryza sativa L.) tiller bud growth. Auxin inhibits bud growth and CTK promotes growth; however, little is known about the positional effects of these hormones in the regulation of rice tiller bud growth. In the present study, indole-3-acetic acid (lAA) and 6-benzylaminopurine (6-BA) (a synthetic CTK) were applied to different leaves and roots at the tillering and heading stages of rice development, and the growth of rice tiller buds on the unelongated and elongated internodes was measured. Additionally, hormonal variations of the plants were examined and recorded. The objectives of the present study were to investigate the positional effects of auxin and CTK on the regulation of rice tiller bud growth. The results indicate that lAA has a notable positional effect on the regulation of rice tiller bud growth, and the positional effect of lAA was closely related to its polar transport. An increase in leaf lAA levels inhibited the growth of tiller buds located at unelongated nodes; however, growth of tiller buds at elongated nodes was inhibited only when lAA levels were increased in the upper-stem leaves or the leaves at which the tiller bud was located. Contrary to lAA, 6-BA had no positional effect on rice tiller bud growth. Application of 6-BA to different leaves and roots significantly promoted the growth of rice tiller buds at both unelongated and elongated nodes.

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Effects of Nitrogen and 6‐Benzylaminopurine on Rice Tiller Bud Growth and Changes in Endogenous Hormones and Nitrogen

Cited by 70 publications

References 31 publications

The interaction between nitrogen availability and auxin, cytokinin, and strigolactone in the control of shoot branching in rice (Oryza sativa L.)

The interaction between nitrogen availability and auxin, cytokinin, and strigolactone in the control of shoot branching in rice (Oryza sativa L.)

The Impacts of Nano-Structured Nutrients on Chickpea Performance under Supplemental Irrigation

The Positional Effects of Auxin and Cytokinin on the Regulation of Rice Tiller Bud Growth

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