Effect of Relative Humidity on Pathogenicity Of Mucuna sloanei seed by Fungi.

(1) Gbarabe, Roland2Daye,Barango Owuna  (3). Etukudoh, Ndarake E.

1,2Department of Biological Sciences, Rivers State College of Arts and Sciences, 

Rumuola Port Harcourt, Nigeria

3Rivers State University of Technology, P.M.B 5080, Port Harcourt, Rivers State, Nigeria

Abstract 

arious  factors are responsible for the spoilage  of stored Mucuna sloanei Seed and other

Agricultural produce. The  most relevant ones are fungal  diseases.   Thus, this present

Investigation was under taken to determine the effects of environmental relative humidity on

the pathogenicity  of M. sloanei   by  the seed  and the soil  borne    fungi.  Pathogenic fungi

(Aspergillus flavus,  Aspergillus niger, Penicilliums  scherotigeilum and Botryodiplodia

theobromae)  were  isolated from the infested   M. sloanei seed and from the soil  and

inoculated into M. sloanei  for the experiment.The  inoculated seeds were  kept in Relative

Humidity (10, 20, 40, 60 80 and 100%) chambers (exposed to light  and in darkness for 21

days then examined for rot, appearance and for feel. Results indicated that seed borne fungi

were more pathogenic as compared to soil isolates. Aspergillus specie was more pathogenic

in all the treatment options as compared to other organisms. The results also indicated that

exposing the  inoculated  seeds  to lower and  higher relative  humidity  in  the dark  did not

significantly  increased  the  pathogenicity  rate  in  all  treatment options.  Correlation  studies

indicated positive relationship between relative humidity and fungal pathogenicity with the

highest (0.96) recorded  in M. sloani seed inoculated with seed borne  A.  flavus exposed  to

light. 

Keys   words: Pathogens, Pathogenicity,  Inoculation, Humidity, Coefficient, Correlation,

Leguminous, Infestation, Mitotic. 

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