Study on the evaluation of waterlogging tolerance about different Dactylis glomerata L. germplasm resources and the difference on microstructure of root under waterlogging stress

Wang, Yin-Chen; Mao, Jingxin; Wang, Shaoqing; Yang, Yuan; Yang, Fan; Jian, Zhang; LinFeng, Jiang; Li, Min-Yang; Yang, Xingyun; Zhang, Jinhua; Zeng, Bing

doi:10.30848/pjb2021-5(8)

Cited by 1 publication

(1 citation statement)

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“…In this study, aerenchyma formation was observed in control conditions in both TF and CF plants, with a greater ratio in TF plants. The formation of aerenchyma in the roots of TF plants under control conditions has also been reported by Liu et al [29], whereas there was no or less area of aerenchyma found in control CF plants reported by Wang et al [43]. This finding again confirms the waterlogging tolerance of TF plants, and it may be useful in screening genetic resources for the breeding of waterlogging-tolerant TF cultivars.…”

Section: Discussionsupporting

confidence: 84%

Aerenchyma Formation in Adventitious Roots of Tall Fescue and Cocksfoot under Waterlogged Conditions

et al. 2021

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The formation of aerenchyma in adventitious roots is one of the most crucial adaptive traits for waterlogging tolerance in plants. Pasture grasses, like other crops, can be affected by waterlogging, and there is scope to improve tolerance through breeding. In this study, two summer-active cocksfoot (Dactylis glomerata L.) cultivars, Lazuly and Porto, and two summer-active tall fescue (Lolium arundinaceum Schreb., syn. Festuca arundinacea Schreb.) cultivars, Hummer and Quantum II MaxP, were selected to investigate the effects of waterlogging on root growth and morphological change. Cultivars were subjected to four periods of waterlogging treatments (7, 14, 21 and 28 days), while comparable plants were kept under free drained control conditions. The experiment was arranged as a split–split plot design, with waterlogging treatments (waterlogged, control) considered as main plots, time periods (days of waterlogging) as subplots and cultivars as sub-subplots. Plants began to show signs of waterlogging stress 14–21 days after the onset of waterlogging treatments. There were no significant differences in shoot biomass between the waterlogged and control plants of any cultivar. However, waterlogging significantly reduced root dry matter in all cultivars, with greater reduction in cocksfoot (56%) than in tall fescue (38%). Waterlogging also led to increased adventitious root and aerenchyma formation in both species. Cocksfoot cultivars showed a greater increase in adventitious roots, while tall fescue cultivars had a greater proportion of aerenchyma. Both cultivars within each species showed similar responses to waterlogging treatments. However, an extended screening program is needed to identify whether there are varietal differences within species, which could be used to discover genes related to aerenchyma or adventitious root formation (waterlogging tolerance) for use in breeding programs.

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Section: Discussionsupporting

confidence: 84%