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Joshua H. Freeman, G.A. Miller, S.M. Olson, and W.M. Stall

Over the last decade, the popularity of triploid watermelons has increased. However, unlike diploid or seeded watermelons, triploid watermelon plants have an uneven number of chromosomes and consequently are not able to produce viable pollen

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Shih-wen Lin, Tsung-han Lin, Cynthia Kung Man Yee, Joyce Chen, Yen-wei Wang, Manoj Kumar Nalla, and Derek W. Barchenger

; Pressman et al., 1998 ; Wubs et al., 2009 ). Harnessing crop tolerance to elevated temperatures is essential for sustaining vegetable production in tropical areas and will become even more important under future climate change scenarios. Pollen is the

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Trenton Hamada, Irene Terry, Robert Roemer, and Thomas E. Marler

monogeneric family comprising ≈100 Cycas species ( Hall, 2011 ; Kono and Tobe, 2007 ). All cycad studies to date have shown that wind plays a minimal, if any, role as a pollen vector. A few questions remain concerning the pollination of some Cycas species

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Thomas H. Boyle

Agricultural Experiment Station, under Project No. 746. I extend thanks to Robert L. Wick, Department of Microbiology, University of Massachusetts, for identifying fungi in stored pollen. The cost of publishing this paper was defrayed in part by the payment of

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Peter J. Dittmar, David W. Monks, and Jonathan R. Schultheis

, 1951 ); and in 2005, three-fourths of the United States' watermelon production was devoted to triploid cultivars ( USDA, Economic Research Service, 2005 ). In triploid watermelon production, diploids are included as a viable pollen source for

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David M. Czarnecki II, Amanda J. Hershberger, Carol D. Robacker, David G. Clark, and Zhanao Deng

pollen that can be transferred onto native lantana’s flowers by pollinators. Dehgan (2006) indicated the existence of a wide range of pollen stainability (from less than 5% in Patriot™ ‘Sunburst’ to more than 80% in ‘Professor Raoux’) in L . camara

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Darin A. Sukha, Pathmanathan Umaharan, and David R. Butler

Soria, 1968 ; Falque et al., 1995 , 1996 ; Glendinning, 1963 ; Iwaro et al., 2003 ; Lachenaud, 1994 , 1995 ). A number of studies have described the specific effect of pollen parent on yield and some pod characteristics ( Iwaro et al., 2003

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Renjuan Qian, S. Brooks Parrish, Sandra B. Wilson, Gary W. Knox, and Zhanao Deng

‘Mario Pollsa’ porterweed ( Stachytarpheta spp.). Through controlled crosses, the potential for nettleleaf porterweed to hybridize with jamaican porterweed was realized. However, there is a lack of information, such as ploidy level and pollen

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Joshua H. Freeman, Stephen M. Olson, and William M. Stall

, 2006 ). Unlike diploid plants, triploid watermelon plants do not produce sufficient viable pollen to pollenize themselves ( Maynard, 1992 ; Maynard and Elmstrom, 1992 ). To achieve optimal triploid watermelon yields, 20% to 33% of the plants in the

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Audrey M. Sebolt and Amy F. Iezzoni

compatibility groups is used to identify cross-compatible cultivars for field planting ( Matthews and Dow, 1969 ). Yet, despite the availability of compatible pollen and abundant flowers, fruit set in both sweet and sour cherry is frequently less than adequate