Two apple crosses and one pear cross were carried out using three different pollen densities. In one of the apple crosses, both fruit and seed set decreased when a mixture of pollen and powder (diluted pollen treatment) was used for pollination. Also, seedlings from the undiluted treatment were more vigorous than those originating from pollination with diluted pollen. In the other apple cross, however, no effect on fruit set, seed set or growth in the first year was found. Mean diameter after the second year differed among treatments, but did not seem to be related to pollen density. For pear, the number of good seeds decreased and the number of deaf, probably unfertilized, seeds increased with decreasing pollen density. However, there was no apparent significant effect of pollen density on seedling growth. With respect to scab resistance and mildew attack in both apple crosses, no differences among treatments were found. The results indicate that gametophytic competition may occur in apple crosses, but that it is probably weaker in pear.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
Dayton DF (1974) Overcoming self-incompatibility in apple with killed compatible pollen. J Am Soc Hortic Sci 99:190–192
Gorter CJ, Visser T (1958) Parthenocarpy of pears and apples. J Hortic Sci 33:217–227
Karnatz A (1963) Untersuchungen über das natürliche Ausmaß der Parthenokarpie bei Kernobstsorten. Züchter 33:249–259
Kobel F (1954) Lehrbuch des Obstbaus. Springer, Berlin Heidelberg New York
Mulcahy DL (1979) The rise of the angiosperms: a genecological factor. Science 206:20–23
Mulcahy DL, Mulcahy GB, Ottaviano E (1975) Sporophytic expression of gametophytic competition in Petunia hybrida. In: Mulcahy DL (ed) Gamete competition in plants and animals. North Holland Publ, Amsterdam, pp 227–232
Mulcahy DL, Mulcahy GB, Ottaviano E (1978) Further evidences that gametophytic selection modifies the genetic quality of the sporophyte. Soc Bot Fr Actual Bot 1–2:57–60
Ottaviano E, Mulcahy DL (1989) Genetics of angiosperm pollen. Adv Genet 26:1–64
Petolino JF, Cowen NM, Thompson SA, Mitchell JC (1992) Gamete selection for heat stress tolerance in maize. In: Ottaviano E, Mulcahy DL, Sari Gorla M, Bergamini Mulcahy G (eds) Proc Int Symp Angiosperm Pollen and Ovules. Springer, Berlin Heidelberg New York Tokyo, pp 355–358
Sari Gorla M, Frova C, Redaelli E (1986) Extent of gene expression at the gametophytic phase in maize. In: Mulcahy DL, Bergamini-Mulcahy G, Ottaviano E (eds) Biotechnology and ecology of pollen. Springer, Berlin Heidelberg New York Tokyo, pp 27–32
Sari Gorla M, Ottaviano E, Frascaroli E, Landi P (1989) Herbicide-tolerant corn by pollen selection. Sex Plant Reprod 2:65–69
Stephenson AG, Winsor JA, Davis LE (1986) Effects of pollen load size on fruit maturation and sporophytic quality in zucchini. In: Mulcahy DL, Bergamini Mulcahy G, Ottaviano E (eds) Biotechnology and ecology of pollen. Springer, Berlin Heidelberg New York Tokyo, pp 429–434
Tanksley SD, Zamir D, Rick CM (1981) Evidence for extensive overlap of sporophytic and gametophytic gene expression in Lycopersicon esculentum. Science 213:453–455
Ter-Avanesian DV (1978) The effect of varying the number of pollen grains used in fertilization. Theor Appl Genet 52:77–79
Visser T (1981) Pollen and pollination experiments. IV. “Mentor pollen” and “pioneer pollen” techniques regarding incompatibility and incongruity in apple and pear. Euphytica 30:363–369
Visser T, De Vries DP (1970) Precocity and productivity of propagated apple and pear seedlings as dependent on the juvenile period. Euphytica 19:141–144
Visser T, Marcucci MC (1983) Pollen and pollination experiments. IX. The pioneer pollen effect in apple and pear related to the interval between pollinations and the temperature. Euphytica 32:703–709
Visser T, Verhaegh JJ (1988) The influence of double pollination and pollen load on seed set and seedling vigor of apple and pear. In: Cresti M, Gori P, Pacini E (eds) Sexual reproduction in higher plants. Springer, Berlin Heidelberg New York London Paris Tokyo, pp 369–374
Visser T, Sniezko R, Marcucci CM (1988) The effect of pollen load on pollen tube performance in apple, pear and rose styles. In: Cresti M, Gori P, Pacini E (eds) Sexual reproduction in higher plants. Springer, Berlin Heidelberg New York London Paris Tokyo, pp 75–80
Visser T, Verhaegh JJ, De Vries DP (1976) A comparison of apple and pear seedlings with respect to the juvenile period. I. Seedling growth and yield. Euphytica 25:343–351
Wertheim SJ (1984) The effect of pollinator density on the behaviour of Doyenné du Cornice pear. Acta Hortic 161:211–219
Willing RP, Mascarenhas JP (1984) Analysis of complexity and diversity of mRNAs from pollen and shoots of Tradescantia. Plant Physiol 75:865–868
Zamir D, Gadish I (1987) Pollen selection for low temperature adaptation in tomato. Theor Appl Genet 74:545–548
About this article
Cite this article
Janse, J., Verhaegh, J.J. Effects of varying pollen load on fruit set, seed set and seedling performance in apple and pear. Sexual Plant Reprod 6, 122–126 (1993). https://doi.org/10.1007/BF00227656
- Gametophytic competition
- Seedling vigor