Summary
Early stages of the infection process of Puccinia hordei isolate 1.2.1 and of a P. recondita f.sp. tritici isolate were studied on adult plants of four barley lines and one wheat line. Two of the barley lines are extremely susceptible to P. hordei, the other two have a very high level of partial resistance.
A histological study based on a trypan blue staining indicated that stoma penetration by P. hordei isolate 1.2.1 was equally successful on the susceptible as on the partially resistant adult barley plants. Abortion of substomatal vesicles was rare in all lines. These results do not support a hypothesis that mechanisms of partial resistance in adult plants differ from those in seedlings by a substantial abortive stoma penetration.
Also in the nonhost combinations wheat-P. hordei and barley-P. recondita f.sp. tritici inhibition of stoma penetration and of substomatal vesicle development appears to play a biologically insignificant role in adult plants.
The proportion of stoma penetration on the leaf sheaths of two of the barley lines was as high as on the leaf blades of the flag leaf and the leaf below the flag leaf. There was no evidence for stomatal exclusion as a crucial factor in the relatively low infectibility of leaf sheaths to leaf-blade specialized rust species.
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References
Asher, M. J. C. & C. E., Thomas, 1983. The expression of partial resistance to Erysiphe graminis in spring barley. Plant Pathology 32: 79–89.
Kochman, J. K. & J. F., Brown, 1975. Development of the stem and crown rust fungi on leaves, sheaths, and peduncles of oats. Phytopathology 65: 1404–1408.
Niks, R. E., 1981. Appressorium formation of Puccinia hordei on partially resistant barley and two non-host species. Neth. J. Pl. Pathol. 87: 201–207.
Niks, R. E., 1982. Early abortion of colonies of leaf rust, Puccinia hordei, in partially resistant barley seedlings. Can. J. Bot. 60: 714–723.
Niks, R. E., 1983a. Comparative histology of partial resistance and the nonhost reaction to leaf rust pathogens in barley and wheat seedlings. Phytopathology 73: 60–64.
Niks, R. E., 1983b. Haustorium formation by Puccinia hordei in leaves of hypersensitive, partially resistant, and nonhost plant genotypes. Phytopathology 73: 64–66.
Niks, R. E., 1986. Failure of haustorial development as a factor in slow growth and development of Puccinia hordei in partially resistant barley seedlings. Physiol. Molec. Plant Pathol. 28: 309–322.
Niks, R. E. & R. G., Dekens, 1987. Histological studies on the infection of triticale, wheat and rye by Puccinia recondita f.sp. tritici and P. recondita f.sp. recondita. Euphytica 36: 275–285.
Parlevliet, J. E., 1978. Race-specific aspects of polygenic resistance of barley to leaf rust, Puccinia hordei. Neth. J. Pl. Pathol. 84: 121–126.
Parlevliet, J. E. & C., Kievit, 1986. Development of barley leaf rust, Puccinia hordei, infections in barley. I. Effect of partial resistance and plant stage. Euphytica 35: 953–959.
Romig, R. W. & R. M., Caldwell, 1964. Stomatal exclusion of Puccinia recondita by wheat peduncles and sheaths. Phytopathology 54: 214–218.
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Niks, R.E. The importance of abortive stoma penetration in the partial resistance and nonhost reaction of adult barley and wheat plants to leaf rust fungi. Euphytica 36, 725–731 (1987). https://doi.org/10.1007/BF00051855
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DOI: https://doi.org/10.1007/BF00051855