Changes in root xylem anatomy of peanut genotypes with different drought resistance levels under early-season drought

Thangthong, N. and Jogloy, S. and Jongrungklang, N. and Kvien, C.K. and Dodd, I.C. and Vorasoot, N. (2021) Changes in root xylem anatomy of peanut genotypes with different drought resistance levels under early-season drought. Journal of Agronomy and Crop Science, 205 (5). pp. 803-813. ISSN 0931-2250

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Abstract

During the 2014 and 2015 seasons, peanut root anatomy studies were conducted under well-watered and under drought conditions using three peanut genotypes which are known to differ in their physiological responses to early- and mid-season drought (ICGV 98,305, ICGV 98,324 and Tifton-8). Cross sections of the newly formed roots revealed that the average vessel diameter and total vessel area in the first-order roots were significantly reduced under drought in ICGV 98,305 and ICGV 98,324, yet not in Tifton-8, which had the smallest vessel diameters and total area in both well-watered and drought treatments. The xylem vessel structure in newly formed roots of ICGV 98,324 was very responsive to changes in soil moisture content. This adaptive capacity of ICGV 98,324 to change xylem structure as soil moisture conditions change may provide plant breeders an important trait which will lead to better water-use efficiencies in both moist and drought conditions.