Effects of Low Water Availability on Root Placement and Shoot Development in Landraces and Modern Barley Cultivars
Effects of Low Water Availability on Root Placement and Shoot Development in Landraces and Modern Barley Cultivars
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DOI：
10.3390/agronomy10010134
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发表时间：
2020-01-01
期刊：
影响因子：
3.7
通讯作者：
Igartua, Ernesto
中科院分区：
文献类型：
--
作者：
Boudiar, Ridha;Casas, Ana M.;Igartua, Ernesto
早活力被认为是干旱环境下生长的谷物的有利性状。本研究旨在比较三个西班牙大麦地方品种与三个现代品种的早期茎和根生长特征。基因型在自动表型平台GrowScreen-Rhizo中生长，在水分充足和干旱的条件下生长。试验过程中自动记录种子根长、侧根长、根系宽度和深度。干旱导致茎部（干重减少43%）比根系（干重减少23%）的生长减少更大。在没有胁迫的情况下，基因型差异更大，部分原因是在这种处理下，地方品种的生长更加丰富。SBCC146处理对茎部生长最有利，而SBCC073处理将更多同化物转移到根系生长。在两种条件下，所有基因型中，Cierzo的根干重最小，Cierzo的根干重最大。当种子根在干燥土壤中不能进一步生长时，根的生长被重定向到侧根。本研究揭示了大麦早期生长动态中存在遗传多样性。SBCC073和SBCC146的不同生长模式有待进一步研究，以检验它们是否会影响干旱环境下大麦的田间生产性能。
Early vigor has been proposed as a favorable trait for cereals grown in drought-prone environments. This research aimed at characterizing early stage shoot and root growth of three Spanish barley landraces compared with three modern cultivars. Genotypes were grown in an automated phenotyping platform, GrowScreen-Rhizo, under well-watered and drought conditions. Seminal and lateral root length, root system width and depth were recorded automatically during the experiment. Drought induced greater growth reduction in shoots (43% dry weight reduction) than in roots (23% dry weight). Genotypic differences were larger under no stress, partly due to a more profuse growth of landraces in this treatment. Accession SBCC146 was the most vigorous for shoot growth, whereas SBCC073 diverted more assimilates to root growth. Among cultivars, Cierzo was the most vigorous one and Scarlett had the least root dry weight of all genotypes, under both conditions. Root growth was redirected to lateral roots when seminal roots could not progress further in dry soil. This study reveals the presence of genetic diversity in dynamics of early growth of barley. The different patterns of growth observed for SBCC073 and SBCC146 should be explored further, to test if they affect field performance of barley in drought-prone environments.