A Handbook of Rice Seedborne Fungi by T.W. Mew, P. Gonzales

By T.W. Mew, P. Gonzales

This instruction manual specializes in the $64000 seedborne fungi that reason ailments of the foliage, stem, leafsheath, root, grain, and inflorescence in rice. It offers details on greater than 50 species which have been detected in rice seed in the course of regimen checking out and analysis.
Seed healthiness checking out can also be a method of quality controls that guarantees the trade of top of the range seed between scientists or examine facilities. hence, the Seed healthiness Unit at IFW capabilities because the gatekeeper of secure germplasm stream from and inside IRRI, the Philippines, and outdoors.

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91-cm diam in 5 d. They are zonated, slightly cottony, with a 39 Detection frequency (%) 120 East Asia Europe Latin America South Asia Southeast Asia Sub-Saharan Africa 100 80 60 40 20 0 Detection level (%) 100 80 60 40 20 0 1990 1991 1992 1993 1994 1995 1996 1997 Year Fig. 39. Detection frequency (a) and level (b) of Curvularia sp. from imported untreated seeds, 1990-97. black conidial area with 3-mm sterile white margins. The colony on the reverse side of the agar plate appears zonated, black, and light outward.

On (a) whole seed (10X), (b) awn portion (32X), and (c) sterile lemmas (50X) showing minute, shiny, and globose false heads. Photomicrograph of S. oryzae showing (d) mycelia, (e) conidiophores, and (f) conidia at 40X and stained with lactophenol blue. Observed frequency (%) 50 40 30 20 10 0 Sterile lemmas Awn Partitio n Entire bet. lemma se ed and palea Lemma/ palea only or both Seed part Fig. 36. Observed frequency of Sarocladium oryzae occurrence on the seed. Fig. 37. Plate cultures of Sarocladium oryzae (Sawada) W.

Mycelium—light brown; not branched, septated (Fig. 52d). b. Conidiophores—short, simple, inflated below the tip (Fig. 52e). c. Conidia (aleuriospore)—globose or subglobose, smooth, dark, one-celled, borne apically and singly (Fig. 52f). 10 µ (MEA). Colony characters on culture media (Fig. 58-cm diam in 5 d. They are slightly zonated, grayish, and later become light outward with sinuate margins. The colony on the reverse side of the agar plate appears azonated and gray. 07-cm diam in 5 d. They are azonated, becoming azonated toward the margins, slightly floccose and pressed to the media, and gray.

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