Altered Expression of OsAAP3 Influences Rice Lesion Mimic and Leaf Senescence by Regulating Arginine Transport and Nitric Oxide Pathway

Wei, Qilang; Yan, Zhenwei; Xiong, Yifan; Fang, Zhongming

doi:10.3390/ijms22042181

Cited by 15 publications

(10 citation statements)

References 51 publications

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“…It was shown in Arabidopsis that the AAP8 (Amino Acid Permease 8) plays a key role in amino acid phloem loading and its function strongly affects sink size and number [ 122 ]. Interestingly, a recent paper shows that increasing the expression of the rice OsAAP3 that facilitates the transport of arginine and lysine into the mesophyll cells influences leaf senescence [ 123 ]. The overexpression of OsAAP3 decreases grain yield and leads to lesion mimic and leaf senescence in rice flag leaves by an increase of nitric oxide.…”

Section: Leaf Senescence and Nitrogen Metabolismmentioning

confidence: 99%

Current Understanding of Leaf Senescence in Rice

Lee

Masclaux-Daubresse

2021

IJMS

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Leaf senescence, which is the last developmental phase of plant growth, is controlled by multiple genetic and environmental factors. Leaf yellowing is a visual indicator of senescence due to the loss of the green pigment chlorophyll. During senescence, the methodical disassembly of macromolecules occurs, facilitating nutrient recycling and translocation from the sink to the source organs, which is critical for plant fitness and productivity. Leaf senescence is a complex and tightly regulated process, with coordinated actions of multiple pathways, responding to a sophisticated integration of leaf age and various environmental signals. Many studies have been carried out to understand the leaf senescence-associated molecular mechanisms including the chlorophyll breakdown, phytohormonal and transcriptional regulation, interaction with environmental signals, and associated metabolic changes. The metabolic reprogramming and nutrient recycling occurring during leaf senescence highlight the fundamental role of this developmental stage for the nutrient economy at the whole plant level. The strong impact of the senescence-associated nutrient remobilization on cereal productivity and grain quality is of interest in many breeding programs. This review summarizes our current knowledge in rice on (i) the actors of chlorophyll degradation, (ii) the identification of stay-green genotypes, (iii) the identification of transcription factors involved in the regulation of leaf senescence, (iv) the roles of leaf-senescence-associated nitrogen enzymes on plant performance, and (v) stress-induced senescence. Compiling the different advances obtained on rice leaf senescence will provide a framework for future rice breeding strategies to improve grain yield.

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Section: Leaf Senescence and Nitrogen Metabolismmentioning

confidence: 99%

Current Understanding of Leaf Senescence in Rice

Lee

Masclaux-Daubresse

2021

IJMS

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“…In this study, the addition of high concentrations of Lys and Arg inhibited the elongation of first and second axillary buds in rice ( Figure 1 ). One possible explanation is that Lys and Arg can influence antioxidant enzymes activities and photosynthetic pathway by initiating the ROS accumulation and nitric oxide signaling pathway ( Wei et al, 2021 ). Our results also showed that nitrogen metabolism, stress, and photosynthetic pathways play important roles in response to amino acids Lys and Arg in axillary buds.…”

Section: Discussionmentioning

confidence: 99%

Melatonin Mediates Axillary Bud Outgrowth by Improving Nitrogen Assimilation and Transport in Rice

2022

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Melatonin plays an important role in plant resistance to biotic and abiotic stresses. However, whether melatonin is involved in the regulation of plant architecture, such as the formation of axillary bud outgrowth or tillering, in rice remains unknown. Here, we found that different concentrations of melatonin influenced axillary bud outgrowth in rice, and moderate melatonin concentrations also alleviated the inhibition of axillary bud outgrowth in the presence of high concentrations of basic amino acids lysine and arginine. Furthermore, transcriptome analysis demonstrated that genes involved in nitrogen metabolism and phytohormone signal transduction pathways may affect axillary bud outgrowth, which is regulated by melatonin. We determined that the differentially expressed genes glutamine synthetase OsGS2 and amino acid transporter OsAAP14, which are involved in nitrogen metabolism and are regulated by melatonin and basic amino acids, were the key regulators of axillary bud outgrowth in rice. In addition, we validated the functions of OsGS2 and OsAAP14 using rice transgenic plants with altered axillary bud outgrowth and tillers. Taken together, these results suggest that melatonin mediates axillary bud outgrowth by improving nitrogen assimilation and transport in rice.

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“…In poplar (Populus trichocarpa), the Gln content of senescing leaves dramatically increased, and a cationic amino acid transporter, Pt-CAT11, played an important role in the transfer of Gln during the senescence process (Couturier et al, 2010). In rice, overexpression lines of OsAAP3 exhibited accelerated leaf yellowing phenotype, whereas RNA interference (RNAi) lines of OsAAP3 exhibited delayed leaf yellowing (Wei et al, 2021).…”

Section: Amino Acid Metabolism During N Deficiency-induced N Remobili...mentioning

confidence: 99%

Molecular basis of nitrogen starvation-induced leaf senescence

Sakuraba

2022

Front. Plant Sci.

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Nitrogen (N), a macronutrient, is often a limiting factor in plant growth, development, and productivity. To adapt to N-deficient environments, plants have developed elaborate N starvation responses. Under N-deficient conditions, older leaves exhibit yellowing, owing to the degradation of proteins and chlorophyll pigments in chloroplasts and subsequent N remobilization from older leaves to younger leaves and developing organs to sustain plant growth and productivity. In recent years, numerous studies have been conducted on N starvation-induced leaf senescence as one of the representative plant responses to N deficiency, revealing that leaf senescence induced by N deficiency is highly complex and intricately regulated at different levels, including transcriptional, post-transcriptional, post-translational and metabolic levels, by multiple genes and proteins. This review summarizes the current knowledge of the molecular mechanisms associated with N starvation-induced leaf senescence.

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Altered Expression of OsAAP3 Influences Rice Lesion Mimic and Leaf Senescence by Regulating Arginine Transport and Nitric Oxide Pathway

Cited by 15 publications

References 51 publications

Current Understanding of Leaf Senescence in Rice

Current Understanding of Leaf Senescence in Rice

Melatonin Mediates Axillary Bud Outgrowth by Improving Nitrogen Assimilation and Transport in Rice

Molecular basis of nitrogen starvation-induced leaf senescence

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