稻小粒菌核病之研究(II)田土中菌核之密度及不同水份潛勢對病菌生長之影響
Other Title
Studies on Stem-rot Disease of Rice－II. The Population Density of Sclerotia in Rice Paddy and the Effect of Water Potential on the Growth of the Pathogen.
Journal
中華農業研究
Journal Volume
32
Journal Issue
3
Pages
279-285
Date Issued
1983-09-10
Date
1983-09-10
Author(s)
簡錦忠
曾方明
謝麗娟
C.C. Chien
F.M. Thseng
L.C. Shieh
Abstract
調查本省11 個水稻田土中小粒菌核病菌菌核的密度，以萬巒篩出的菌核數最多為410 個／公克土，而雙龍1 最少僅7.2 個／公克土。不同水份潛勢對小粒菌核病菌菌絲生長的影響，因溫度的不同而有差異，一般而言高溫下菌絲活力或菌核的形成能力對乾旱的忍受力較低溫時為強。雖然小黑菌絲生長速度較小球為慢，同時小球菌在各種水份潛勢下之菌核發芽率較小黑為強；但小黑菌的菌絲耐旱性及其在乾旱狀況下形成菌核的能力皆較小球菌為強。
The population density of the sclerotia causing stem rot in paddy rices was surveyed at 11 locations in Taiwan. The highest population, 410 sclerotia/g soil, was recorded in Wan-Luan, and the lowest, 7.2 sclerotia/g soil, in Shuang-lung. The effect of water potential on the mycelial growth of rice stem rot pathogens varied among temperatures. In general, the ability of mycelial growth and the sclerotial formation were more endurable to drought in higher temperatures (24, 28, 32 °C) than in lower temperatures (12, 16, 20 °C). Although the rate of mycelial growth and scierotial germination of the small round disease pathogen were superior to that of small black disease pathogen in all different to drought water potentials. However, the resistance of mycelium to drought and the ability of sclerotial formation under drought condition, the small round disease pathogen was inferior to the small black disease pathogen.
Publisher
農業試驗所
Type
journal article
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