Interaction of two symbiotic genes, nod3 and Nod5, in one genotype of pea Pisum sativum L.

Senescence is induced by endogenous physiological changes or exogenous stresses in plants. Here, we isolated two alleles of a novel rice (Oryza sativa L.) mutant, yellow and premature dwarf 1 (ypd1). The ypd1 mutants exhibited a yellow and dwarf phenotype from germination, and premature senescence starting at tillering. Moreover, the ypd1 mutants were sensitive to high light, which accelerated cell death and senescence. Consistent with their yellow phenotype, the ypd1 mutants had abnormal chloroplasts and lower levels of photosynthetic pigments. Trypan blue staining, TUNEL experiments, NBT staining, and DAB staining demonstrated that the ypd1 mutants showed cell death and accumulated reactive oxygen species. Moreover, the ypd1 mutants showed increased expression of senescence-associated genes. Map-based cloning revealed a substitution (G→A) in exon 6 (ypd1-1) and 13 (ypd1-2) of LOC_Os06g13050 that affected splicing and caused premature termination of the encoded protein. YPD1 was preferentially expressed in the leaf and encodes an LRR-Like1 (LRRL1) protein. Complementation, overexpression, and targeted deletion experiments confirmed that the mutations in YPD1 cause the ypd1 phenotype. YPD1 localized on the chloroplast membrane. These findings revealed that the novel rice LRRL1 protein YPD1 affects rice chloroplast development and leaf senescence.

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The rice LRR-like1 protein YELLOW AND PREMATURE DWARF 1 is involved in leaf senescence induced by high light

Chen

Qiu

et al. 2020

Journal of Experimental Botany

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Never too many? How legumes control nodule numbers

Mortier

Holsters

Goormachtig

2011

Plant Cell & Environment

122

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Restricted availability of nitrogen compounds in soils is often a major limiting factor for plant growth and productivity. Legumes circumvent this problem by establishing a symbiosis with soil-borne bacteria, called rhizobia that fix nitrogen for the plant. Nitrogen fixation and nutrient exchange take place in specialized root organs, the nodules, which are formed by a coordinated and controlled process that combines bacterial infection and organ formation. Because nodule formation and nitrogen fixation are energy-consuming processes, legumes develop the minimal number of nodules required to ensure optimal growth. To this end, several mechanisms have evolved that adapt nodule formation and nitrogen fixation to the plant's needs and environmental conditions, such as nitrate availability in the soil. In this review, we give an updated view on the mechanisms that control nodulation.

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The use of symbiotic pea mutants to improve nodulation and nitrogen fixation

Sidorova

Shumny

Goncharova³

et al. 2010

Dokl Biol Sci

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Interaction of two symbiotic genes, nod3 and Nod5, in one genotype of pea Pisum sativum L.

Cited by 3 publications

References 1 publication

The rice LRR-like1 protein YELLOW AND PREMATURE DWARF 1 is involved in leaf senescence induced by high light

The rice LRR-like1 protein YELLOW AND PREMATURE DWARF 1 is involved in leaf senescence induced by high light

Never too many? How legumes control nodule numbers

The use of symbiotic pea mutants to improve nodulation and nitrogen fixation

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