Roots of Lucerne Seedlings are More Resilient to a Water Deficit than Leaves or Stems

Luo, Yong; Liu, Hui; Yan, Guijun; Li, Guang; Turner, Neil C.

doi:10.3390/agronomy9030123

Cited by 14 publications

(13 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Not only was root dry weight increased in the moderate stress treatment, but also the number of lateral roots, enabling greater water uptake from the drying soil. This confirmed a previous observation that roots of lucerne seedlings are more resilient to water deficits than the leaves or stems, and not just at the seedling stage [29], but also throughout the vegetative stage to flowering. In this way, plants can reduce the consumption of water by minimizing the evaporative area and water use, a drought-avoidance strategy [30], while fully exploring the soil volume for water.…”

Section: Discussionsupporting

confidence: 91%

Morphological Features and Biomass Partitioning of Lucerne Plants (Medicago sativa L.) Subjected to Water Stress

Luo

Yan

et al. 2020

Agronomy

Self Cite

View full text Add to dashboard Cite

Drought is one of the major abiotic stresses affecting the morphological, physiological, and metabolic processes of plants, and hence their growth and production on a global scale. Lucerne (Medicago sativa L.) is one of the most popular pasture species in semi-arid regions and plays a critical role in sustaining agricultural systems in many areas of the world. In order to evaluate the effect of water deficits on the growth and biomass distribution in different tissues of lucerne, plant height, leaf dry weight, leaf number and area, root dry weight, taproot length and lateral root number, and stem dry weight were measured at four stages from the seedling to flowering stages under three water regimes: (i) adequate water supply (minimum soil water content 85% pot capacity (PC)), (ii) moderate water stress (65% PC), and (iii) severe water stress (45% PC), imposed under a rainout shelter. With limited water supply, plant height, leaf number, leaf area and dry weight, taproot length, and total biomass were reduced, while lateral root numbers increased. The number of smaller leaves and root dry weight increased under moderate water stress, whereas severe water stress reduced them. Leaf, stem, and total dry weight were all reduced by the water deficits, but leaf dry weight was reduced the most and root dry weight the least, so there was a redistribution of biomass towards the roots, increasing the root–shoot ratio. These results help us to understand the response of lucerce to water stress and assist in developing a foundation for the sustainable use of lucerne in semi-arid agricultural systems.

show abstract

Section: Discussionsupporting

confidence: 91%

Morphological Features and Biomass Partitioning of Lucerne Plants (Medicago sativa L.) Subjected to Water Stress

Luo

Yan

et al. 2020

Agronomy

Self Cite

View full text Add to dashboard Cite

show abstract

“…The plants were cultivated under a 16 h photoperiod in the greenhouse of Beijing Forestry University, and the ratio of nutritive soil and vermiculite was 1:1 (volume), the pH of water was 5.2-5.5, and the temperature was 25 • C. The seedlings of all the groups were planted under optimal growth conditions as described above, whereas the moderate drought stress group (MD) seedlings and severe drought stress group (SD) seedlings were treated without water for 20 and 40 days, respectively. The duration of drought treatment was determined according to soil water content (SWC), which was measured by the gravimetric method [24]. Every pot was weighed at 15:00 Beijing Standard Time with six pots per treatment.…”

Section: Plant Materials and Drought Conditionsmentioning

confidence: 99%

“…The results showed that 62 DEGs participated in a variety of biological processes (Figure 6a). Most NACs were predicted to participate in cellular process (24) and metabolic process (22). Only VcNAC062 was categorized into responding to stimulus.…”

Section: Go Annotation and Correlation Analysis Of Degsmentioning

confidence: 99%

Identification and Expression of NAC Transcription Factors of Vaccinium corymbosum L. in Response to Drought Stress

Liang

Wang

Sun

et al. 2019

Forests

View full text Add to dashboard Cite

Research Highlights: Phenotypic changes and expression profiles, phylogeny, conserved motifs, and expression correlations of NAC (NAM, ATAF1, ATAF2 and CUC2) transcription factors (TFs) in blueberry genome were detected under drought stress, and the expression patterns and functions of 12 NACs were analyzed. Background and Objectives: Blueberry is an important shrub species with a high level of flavonoids in fruit, which are implicated in a broad range of health benefits. However, the molecular mechanism of this shrub species in response to drought stress still remains elusive. NAC TFs widely participate in stress tolerance in many plant species. The characterization and expression profiles of NAC TFs were analyzed on the basis of genome data in blueberry when subjected to drought stress. Materials and Methods: Combined with the analysis of chlorophyll a fluorescence and endogenous phytohormones, the phenotypic changes of blueberry under drought stress were observed. The phylogenetic tree, conserved motifs, differently expressed genes, and expression correlation were determined by means of multiple bioinformatics analysis. The expression profiles of NACs in different organs were examined and compared through RNA-seq and qRT-PCR assay. Results: The chlorophyll a fluorescence parameters φPo, φEo, φRo, and PIabs of leaves were significantly inhibited under drought stress. ABA (abscisic acid) content noticeably increased over the duration of drought, whereas GA3 (gibberellic acid) and IAA (indole acetic acid) content decreased continuously. A total of 158 NACs were identified in blueberry genome and 62 NACs were differently expressed in leaf and root of blueberry under drought stress. Among them, 14 NACs were significantly correlated with the expression of other NAC genes. Conclusions: Our results revealed the phenotypic changes of this shrub under drought stress and linked them with NAC TFs, which are potentially involved in the process of response to drought stress.

show abstract

“…The authors also presented an abrupt reduction of N concentration after the change of defoliation frequencies, from 42 to 28 days. But with the same fluctuation pattern over the seasons in both defoliation regimes, which suggests that, besides the defoliation frequency, the N reserves mobilization was modulated by external factors, such as temperature and photoperiod (Gramshaw et al, 1993;Teixeira et al, 2007b), and plant water availability (Pembletom et al, 2010;Luo et al, 2019).…”

Section: Perennial Organic Components Storagementioning

confidence: 88%

Factors related to productivity and persistence of lucerne (Medicago sativa) genotypes with different fall dormancy levels: a review

Hoppen

Neres

Moot

2022

RSD

View full text Add to dashboard Cite

The lucerne productive and nutritional potential make it the most used forage legume worldwide. This wide use leads genetic improvement programs to increasingly select the main requirements for a given edaphoclimatic condition. However, in Brazil, the research on genetic improvement of lucerne has been limited over the years, which has hindered the production of this species and the domination of other legumes in animal production, as estilosantes and pigeon pea. This literature review aimed to present results from countries such as New Zealand and Australia that lead the world ranking, as weel as Argentina, in the cultivation of this crop and that can be used as showcase to understand the management of lucerne. From extensive bibliometry analyses in the period between 1963 and 2021, variables as persistence and phyllochron in these countries indicate that it is possible to produce lucerne with similar productivity, longevity and quality in Brazil. Nevertheless, to leverage this production, not only genetic improvement should be aimed, but also research and dissemination of knowledge on the ideal management of defoliation and, mainly, on the choice of the genotype and dormancy level to be cropped by the producer.

show abstract

Roots of Lucerne Seedlings are More Resilient to a Water Deficit than Leaves or Stems

Cited by 14 publications

References 31 publications

Morphological Features and Biomass Partitioning of Lucerne Plants (Medicago sativa L.) Subjected to Water Stress

Morphological Features and Biomass Partitioning of Lucerne Plants (Medicago sativa L.) Subjected to Water Stress

Identification and Expression of NAC Transcription Factors of Vaccinium corymbosum L. in Response to Drought Stress

Factors related to productivity and persistence of lucerne (Medicago sativa) genotypes with different fall dormancy levels: a review

Contact Info

Product

Resources

About