บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effects of equilibrium relative humidity on in vitro growth of Botrytis cinerea and Alternaria alternata.

Alam, S.; Joyce, D.; Wearing, A.;

Australian Journal of Experimental Agriculture Year: 1996 Vol: 36 Issue: 3 Pages: 383-388 Ref: 31 ref.

1996

บทคัดย่อ

Effects of equilibrium relative humidity on in vitro growth of Botrytis cinerea and Alternaria alternata.

Mycelial growth in vitro of B. cinerea and A. alternata responsible for postharvest loss of horticultural produce, was related to equilibrium relative humidity (e.r.h.) at ambient temp. (20 deg C) using solutes to adjust the osmotic water potential of the growth medium. Colony diam. growth of B. cinerea and A. alternata on solid medium (1/2 potato dextrose agar) was initially stimulated slightly when the e.r.h. was decreased from 99.7 (unamended medium) to 99.3% (-0.4 to -1.0 MPa). Thereafter, colony diam. growth continually decreased as a function of reducing e.r.h. over the range 99.3-94.3% e.r.h. (-1.0 to -8.0 MPa). Similar trends were recorded with both pathogens for their dry matter growth in liquid medium (Oxoid Czapek Dox) as a function of osmotic potential. Initial stimulation of dry matter growth at -1.0 MPa (equivalent to 99.3% e.r.h.) was not evident in liquid medium. Fungal growth data suggested that postharvest mycelial growth of B. cinerea and A. alternata on wounds, senescing tiss

ue or secretions such as cell sap or nectar could be restricted through control of e.r.h. in packages of horticultural produce.