Arabidopsis gun4 mutant have greater light energy transfer efficiency in photosystem II despite low chlorophyll content

Daloso, Danilo de Menezes; Antunes, Werner Camargos; Santana, Tessio Araújo de; Pinheiro, Daniel Teixeira; Ribas, Rogério Ferreira; Sachetto-Martins, Gilberto; Loureiro, Marcelo Ehlers

doi:10.1007/s40626-014-0025-z

Cited by 6 publications

(8 citation statements)

References 45 publications

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“…Recent investigations on Chl-deficient mutants have instead shown that such an assumption is too simplistic, and a more careful examination of a series of mechanisms at both leaf and canopy scales is required. The observation of comparable leafscale photosynthetic rates in Chl-deficient and wild types has been reported in other studies (Li et al, 2013;Daloso et al, 2014;Kirst et al, 2017). In particular, Slattery et al, (2017) observed similar results referring to another soybean mutant (Y11y11).…”

Section: Discussionsupporting

confidence: 87%

“…Chlorophyll-deficient mutants are common in plants (Gengenbach, Gorz, & Haskins, 1970;Highkin, 1950;Li et al, 2013;Specht, Haskins, & Gorz, 1975). Mutations leading to 100% albino plants are fatal, whereas other types of mutations that simply reduce chlorophyll (Chl) content (Daloso et al 2014) lead to plants that can successfully complete their life cycle. These plants have frequently been used to investigate how carbon uptake in leaves scales with Chl-content (Benedict, McCree, & Kohel, 1972).…”

Section: Introductionmentioning

confidence: 99%

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Leaf and canopy photosynthesis of a chlorophyll deficient soybean mutant

Sakowska

Alberti

Genesio

et al. 2018

Plant Cell & Environment

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The photosynthetic, optical, and morphological characteristics of a chlorophyll-deficient (Chl-deficient) "yellow" soybean mutant (MinnGold) were examined in comparison with 2 green varieties (MN0095 and Eiko). Despite the large difference in Chl content, similar leaf photosynthesis rates were maintained in the Chl-deficient mutant by offsetting the reduced absorption of red photons by a small increase in photochemical efficiency and lower non-photochemical quenching. When grown in the field, at full canopy cover, the mutants reflected a significantly larger proportion of incoming shortwave radiation, but the total canopy light absorption was only slightly reduced, most likely due to a deeper penetration of light into the canopy space. As a consequence, canopy-scale gross primary production and ecosystem respiration were comparable between the Chl-deficient mutant and the green variety. However, total biomass production was lower in the mutant, which indicates that processes other than steady state photosynthesis caused a reduction in biomass accumulation over time. Analysis of non-photochemical quenching relaxation and gas exchange in Chl-deficient and green leaves after transitions from high to low light conditions suggested that dynamic photosynthesis might be responsible for the reduced biomass production in the Chl-deficient mutant under field conditions.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Leaf and canopy photosynthesis of a chlorophyll deficient soybean mutant

Sakowska

Alberti

Genesio

et al. 2018

Plant Cell & Environment

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“…In A. thaliana , Daloso et al (2014) reported higher Φ PS2 and q P values for a gun4 mutant. This suggests the mutant transfers the excess absorbed light energy more efficiently than the WT plants despite a decrease in chlorophyll content.…”

Section: Discussionmentioning

confidence: 90%

“…The effects of gun4 mutations on photosynthetic activities were briefly discussed for C. reinhardtii (Formighieri et al, 2012) and in more detail for A. thaliana (Daloso et al, 2014). …”

Section: Discussionmentioning

confidence: 99%

“…Although its chlorophyll content is only 37.2% of that of WT plants, the xantha mutant retains a high photosynthetic capacity ( Zhou et al, 2006a ; Wu et al, 2007 ). The effects of gun4 mutations on photosynthetic activities were briefly discussed for C. reinhardtii ( Formighieri et al, 2012 ) and in more detail for A. thaliana ( Daloso et al, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

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The xantha Marker Trait Is Associated with Altered Tetrapyrrole Biosynthesis and Deregulated Transcription of PhANGs in Rice

Jiang

Liu

et al. 2017

Front. Plant Sci.

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The xantha marker trait, which is controlled by a down-regulating epi-mutation of OsGUN4, has been applied to the production of hybrid rice. However, the molecular basis for the ability of xantha mutants to attain high photosynthetic capacity even with decreased chlorophyll contents has not been characterized. In the present study, we observed that the total chlorophyll content of the xantha mutant was only 27.2% of that of the wild-type (WT) plants. However, the xantha mutant still accumulated 59.9% of the WT δ-aminolevulinic acid content, 72.8% of the WT Mg-protoporphyrin IX content, and 63.0% of the WT protochlorophyllide a content. Additionally, the protoporphyrin IX and heme contents in the mutant increased to 155.0 and 160.0%, respectively, of the WT levels. A search for homologs resulted in the identification of 124 rice genes involved in tetrapyrrole biosynthesis and photosynthesis. With the exception of OsGUN4, OsHO-1, and OsHO-2, the expression levels of the genes involved in tetrapyrrole biosynthesis were significantly higher in the xantha mutant than in the WT plants, as were all 72 photosynthesis-associated nuclear genes. In contrast, there were no differences between the xantha mutant and WT plants regarding the expression of all 22 photosynthesis-associated chloroplast genes. Furthermore, the abundance of 1O2 and the expression levels of 1O2-related genes were lower in the xantha mutant than in the WT plants, indicating 1O2-mediated retrograde signaling was repressed in the mutant plants. These results suggested that the abundance of protoporphyrin IX used for chlorophyll synthesis decreased in the mutant, which ultimately decreased the amount of chlorophyll in the xantha mutant. Additionally, the up-regulated expression of photosynthesis-associated nuclear genes enabled the mutant to attain a high photosynthetic capacity. Our findings confirm that OsGUN4 plays an important role in tetrapyrrole biosynthesis and photosynthesis in rice. GUN4, chlorophyll synthesis pathways, and photosynthetic activities are highly conserved in plants and hence, novel traits (e.g., xantha marker trait) may be generated in other cereal crops by modifying the GUN4 gene.

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QTL mapping and candidate gene analysis reveal two major loci regulating green leaf color in non-heading Chinese cabbage

Bai,

Zhao,

et al. 2024

Theor Appl Genet

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Arabidopsis gun4 mutant have greater light energy transfer efficiency in photosystem II despite low chlorophyll content

Cited by 6 publications

References 45 publications

Leaf and canopy photosynthesis of a chlorophyll deficient soybean mutant

Leaf and canopy photosynthesis of a chlorophyll deficient soybean mutant

The xantha Marker Trait Is Associated with Altered Tetrapyrrole Biosynthesis and Deregulated Transcription of PhANGs in Rice

QTL mapping and candidate gene analysis reveal two major loci regulating green leaf color in non-heading Chinese cabbage

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