Correlation between Growth and Frequency Distribution Pattern of Starch Particle Diameter in Stem Base under Drought Stress in Makarikarigrass (Panicum coloratum L. var. makarikariense)

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  • マカリカリグラス (Panicum coloratum L. var. makarikariense) の水ストレス下における生長と茎基部のデンプン粒径の頻度分布との相関関係.

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Abstract

The experiment aimed at examining the relation between growth and distribution pattern of starch particles found in stem base in makarikarigrass during the recovering time after drought stress, to evaluate its recovering ability in growth. At the thirteenth day after the initial treatment (DAT) started, the watering regimes were changed to identify the direct- and after-effects of drought stress. The increasing rate in top dry matter weight (TDMW) tended to be smaller with the increase in the drought stress. However, the suppressing rate was the smallest in semi-drought (SD)-SD plot (at the initial-the second period), resulting in the non-significant difference in TDMW between SD-SD and drought (D)-control plot. The leaves began wilting after 13 DAT and the mean starch particle diameter (MSPD) found in the stem base decreased. The decrease in MSPD was promoted by drought treatments as the direct effect. The starch particle distributed preferentially at the smaller side under the drought conditions, except under SD conditions where it distributed normally over the whole range of diameter. The MSPD was positively correlated with both mean tiller dry matter weight and TDMW at the late stage of drought treatments, suggesting that starch particle formation might relate to shoot growth acclimated to various ranges of drought stress.

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