Journal of Agricultural Research . W4 B >; f^-(^> Journal of Agricultural Research Washington, D. C. Cytology of Wheat Stem Rust Plate 2. Journal of Agricultural Research Washington, D. C. .s GoA PLATE 2Pticcinia graminis tritici form III on Baart (A) and Kanred (B-G) A.—Baart. Series showing alterations of nuclei in infected area. X 1130. a. Normal nucleus from uninfected tissue. b, c, and d. Nuclei from seven-day infection, showing progressive expansion ofnuclei, increase in nucleoli and loosening of chromatin net. e. Maximum size, lo-day , g, and h. Progressive collapse of
Journal of Agricultural Research . W4 B >; f^-(^> Journal of Agricultural Research Washington, D. C. Cytology of Wheat Stem Rust Plate 2. Journal of Agricultural Research Washington, D. C. .s GoA PLATE 2Pticcinia graminis tritici form III on Baart (A) and Kanred (B-G) A.—Baart. Series showing alterations of nuclei in infected area. X 1130. a. Normal nucleus from uninfected tissue. b, c, and d. Nuclei from seven-day infection, showing progressive expansion ofnuclei, increase in nucleoli and loosening of chromatin net. e. Maximum size, lo-day , g, and h. Progressive collapse of nucleus. Ten- and 14-day infections. B.—Kanred. Four-day infection. Two appressoria at one stoma. Each produceda substomatal vesicle (e and/). The infecting hyphae grew in opposite directionsand each produced a haustorium, c and d, in an epidermal cell. Outer guard cellwall modified at 6. X 730. C.—Kanred. Seven-day infection. Guard cell killed by appressorium of fungus epidermal cells weakened and broken. X 730. D.—Kanred. Seven-day infection. Young haustorium o forming from the mothercell b. X 1130. E.—Kanred. Sev
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