By T.W. Mew, P. Gonzales
This guide makes a speciality of the real seedborne fungi that reason ailments of the foliage, stem, leafsheath, root, grain, and inflorescence in rice. It presents details on greater than 50 species which have been detected in rice seed in the course of regimen trying out and analysis.
Seed well-being trying out can be a method of qc that guarantees the alternate of high quality seed between scientists or examine facilities. as a result, the Seed wellbeing and fitness Unit at IFW services because the gatekeeper of secure germplasm flow from and inside IRRI, the Philippines, and outdoors.
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Extra info for A Handbook of Rice Seedborne Fungi
Microconidia—hyaline, fusiform, ovate or clavate; slightly flattened at both ends; one- or twocelled; more or less agglutinated in chains, and remain joined or cut off in false heads (Fig. 30f). 83 µ (OA, oatmeal agar). e. Macroconidia—hyaline, inequilaterally fusoid; slightly sickle-shaped or almost straight; thinwalled; narrowed at both ends, occasionally bent into a hook at the apex and with a distinct foot cell at the base; 3–5 septate, usually 3 septate, rarely 6–7 septate; formed in salmon orange sporodochia or pionnotes (Fig.
58). Microscopic character a. Mycelia—hyaline, septate (Fig. 57d). b. Conidiophore—simple or branched, short, septate with denticles at the terminal portion (Fig. 57e). c. Conidia—elongately oval, single- to 2-celled, very rarely 3-celled; pointed at the basal portion and rounded at the apical portion, hyaline (Fig. 57f). 06 µ (MEA). Colony characters on culture media (Fig. 02-cm diam in 5 d. They are zonated with even margins, floccose, and reddish or- Fig. 56. Occurrence of Pinatubo oryzae on rice seed from different countries received at IRRI (IRRI-SHU unpublished data 1990-97).
49. Observed frequency of Nigrospora sp. occurrence on the seed. 46 Fig. 50. Plate cultures of Nigrospora sp. showing colony growths on PDA, PSA, and MEA incubated at ART, 21 °C, and 28 °C at 15 d after inoculation. of the agar plate appears slightly zonated and black. 38-cm diam in 5 d. They are slightly zonated and densely floccose with sinuate margins, black, and later become light toward the margins. The colony on the reverse side of the agar plate appears slightly zonated and black. 78-cm diam in 5 d.