Enhancing auxin accumulation in maize root tips improves root growth and dwarfs plant height

Li, Zhaoxia; Zhang, Xinrui; Zhao, Yajie; Li, Yujie; Zhang, Guangfeng; Peng, Zhenghua; Zhang, Juren

doi:10.1111/pbi.12751

Cited by 134 publications

(85 citation statements)

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“…Subsequently, they showed that rice PHT1.8 performs a novel biological function during crosstalk between Pi and auxin signalling. This was one of the recent reports that provided clues for the link between auxin and -Pi responses [99]. Sulphate transporters have also implicated in grain PA and P content regulation.…”

Section: Phosphate In Seedsmentioning

confidence: 81%

Phosphorus Transport in Arabidopsis and Wheat: Emerging Strategies to Improve P Pool in Seeds

et al. 2018

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Phosphorus (P) is an essential macronutrient for plants to complete their life cycle. P taken up from the soil by the roots is transported to the rest of the plant and ultimately stored in seeds. This stored P is used during germination to sustain the nutritional demands of the growing seedling in the absence of a developed root system. Nevertheless, P deficiency, an increasing global issue, greatly decreases the vigour of afflicted seeds. To combat P deficiency, current crop production methods rely on heavy P fertilizer application, an unsustainable practice in light of a speculated decrease in worldwide P stocks. Therefore, the overall goal in optimizing P usage for agricultural purposes is both to decrease our dependency on P fertilizers and enhance the P-use efficiency in plants. Achieving this goal requires a robust understanding of how plants regulate inorganic phosphate (Pi) transport, during vegetative growth as well as the reproductive stages of development. In this short review, we present the current knowledge on Pi transport in the model plant Arabidopsis thaliana and apply the information towards the economically important cereal crop wheat. We highlight the importance of developing our knowledge on the regulation of these plants' P transport systems and P accumulation in seeds due to its involvement in maintaining their vigour and nutritional quality. We additionally discuss further discoveries in the subjects this review discusses substantiate this importance in their practical applications for practical food security and geopolitical applications.

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Section: Phosphate In Seedsmentioning

confidence: 81%

Phosphorus Transport in Arabidopsis and Wheat: Emerging Strategies to Improve P Pool in Seeds

et al. 2018

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“…This similitude seems to be the result of duplication events among the genes and a domain rearrangement due to alternative splicing 63,64 , which has modified the number of ARF genes in different species 53,62 . An expression analysis in silico of ZmARF27 showed that this gene in maize is mainly expressed in the seed, tassel and ear 59 , tissues affected by auxin concentration [65][66][67] . For instance, Chen et al 65 found that there is a positive correlation between IAA concentration and ear height.…”

Section: Discussionmentioning

confidence: 99%

Auxin perception in Agave is dependent on the species’ Auxin Response Factors

Cancino-García

Ramírez-Prado

De‐la‐Peña

2020

Sci Rep

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Auxins are one of the most important and studied phytohormones in nature. Auxin signaling and perception take place in the cytosol, where the auxin is sensed. then, in the nucleus, the auxin response factors (ARf) promote the expression of early-response genes. it is well known that not all plants respond to the same amount and type of auxins and that the response can be very different even among plants of the same species, as we present here. Here we investigate the behavior of ARf in response to various auxins in Agave angustifolia Haw., A. fourcroydes Lem. and A. tequilana Weber var. Azul. By screening the available database of A. tequilana genes, we have identified 32 ARF genes with high sequence identity in the conserved domains, grouped into three main clades. A phylogenetic tree was inferred from alignments of the 32 Agave ARF protein sequences and the evolutionary relationship with other species was analyzed. AteqARF 4, 15, 21, and 29 were selected as a representative diverse sample coming from each of the different subclades that comprise the two main clades of the inferred phylogenetic reconstruction. these ARFs showed differential species-specific expression patterns in the presence of indole-3-acetic acid (IAA) and 2,4-dichlorophenoxyacetic acid (2,4-D). Interestingly, A. angustifolia showed different phenotypes in the presence and absence of auxins. In the absence of auxin, A. angustifolia produces roots, while shoots are developed in the presence of iAA. However, in the presence of 2,4-D, the plant meristem converts into callus. According to our results, it is likely that AteqARF15 participates in this outcome.

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“…Other research suggests yield benefits resulting from auxin accumulation in the roots, although the link with whole-plant hydraulics was not documented. On maize, Li et al . (2018) found that maize mutants over-expressing ZmPIN1a exhibited an increase in auxin export from the shoot to the root where its accumulation in the root tips drove enhanced root development that was associated with increased yields under drought, likely through improved water acquisition.…”

Section: Discussionmentioning

confidence: 99%

Potential involvement of root auxins in drought tolerance by modulating nocturnal and daytime water use in wheat

Sadok

Schoppach

2019

Preprint

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1The ability of wheat genotypes to save water by reducing their transpiration rate (TR) under 2 times of the day with high vapour pressure deficit (VPD) has been linked to increasing yields in 3 terminal drought environments. Further, recent evidence shows that reducing nocturnal 4 transpiration (TR N ) could amplify water-saving. Previous research indicates that such traits 5 involve a root-based hydraulic limitation, but the contribution of hormones, particularly auxin 6 and abscisic acid (ABA) has not been explored to explain the shoot-root link. In this 7 investigation, based on physiological, genetic and molecular evidence gathered on a mapping 8 population, we hypothesized that root auxin accumulation regulates whole-plant water use during 9 both times of the day. Eight double-haploid lines were selected from a mapping population 1 0 descending from two parents with contrasted water-saving strategies and root hydraulic 1 1 properties. These spanned the entire range of slopes of TR responses to VPD and TR N 1 2 encountered in the population. On those lines, we examined daytime/night-time auxin and ABA 1 3 contents in the roots and the leaves in relation to hydraulic traits that included whole-plant TR, 1 4 plant hydraulic conductance (K Plant ), slopes of TR responses to VPD and leaf-level anatomical 1 5 traits. Root auxin levels were consistently genotype-dependent in this group irrespective of 1 6 experiments and times of the day. Daytime root auxin concentrations were found to be strongly 1 7 and negatively correlated with daytime TR, K Plant and the slope of TR response to VPD. Night-1 8 time root auxin levels significantly and negatively correlated with TR N . In addition, daytime and 1 9night-time leaf auxin and ABA concentrations did not correlate with any of the examined traits. 0The above results indicate that accumulation of auxin in the root system reduces daytime and 2 1 night-time water use and modulates plant hydraulic properties to enable the expression of water-2 2 saving traits that have been associated with enhanced yields under drought. 2 3 2 4 2 5 2 6

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Enhancing auxin accumulation in maize root tips improves root growth and dwarfs plant height

Cited by 134 publications

References 50 publications

Phosphorus Transport in Arabidopsis and Wheat: Emerging Strategies to Improve P Pool in Seeds

Phosphorus Transport in Arabidopsis and Wheat: Emerging Strategies to Improve P Pool in Seeds

Auxin perception in Agave is dependent on the species’ Auxin Response Factors

Potential involvement of root auxins in drought tolerance by modulating nocturnal and daytime water use in wheat

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