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89 WORKSHOP 4 (Abstr. 166–169) Strategies of Selection, Introduction, and Release of Asexually Propagated Ornamental Plants
epicuticular-wax profiles and potentially reduce losses by onion thrips. Materials and Methods Plant materials. Plant introductions (PIs) 124525, 164807, 165498, 168962, 168966, 171475, 171477, 172701, 172702, 172703, 172704, 174018, 248754
An Introduction to Plant Breeding . Jack Brown and Peter Caligari. 2008. Blackwell Publishing, 9600 Garsington Road, Oxford OX4 2DQ, UK. 209 p. $69.00, paperback. ISBN: 978-1-4051-3344-9. I really wanted to like this book. Well-written books
plates and grown for an additional 24 h for use in the described assays. Table 1. Acidovorax avenae subsp. citrulli isolates used for study. Plant material. Seeds of PIs were obtained from the USDA, ARS, North Central Regional Plant Introduction
of plant introductions (PI) of bottle gourd ( Lagenaria siceraria ) for resistance to powdery mildew caused by Podosphaera xanthii z . Fig. 1. Frequency of distribution of the original screening of 234 bottle gourd ( Lagenaria
in plant introduction 140471 to be near immunity. On the contrary, McGrath et al. (1993) contends no sufficient resistance to GSB is available in melon. Furthermore, resistance in plant introduction 140471 has recently been described as variable
resistance that might be incorporated into improved cultivars of these species. Materials and Methods Plant materials. B. juncea and B. rapa accessions (Plant Introductions) were obtained from the USDA, ARS, North Central Regional Plant
Due to the large area and the complex topography and climate. a great deal of wild ornamental plants are still hidden in the depth of forests and on the highland plateaus--places difficult to approach by man. In the Three N Regions only, there are 51 species of Rhododendron, 27 of Lilium, 83 of Rosa, 30 of Iris, 40 of Clematis, etc., yet to be explored and utilized. Aiming at this, we made extensive introduction of plants in general and intensive introduction of certain families and genera in particular, with good results. At present we have in our living collection 12 species of Clematis, 24 of Rosa, 13 of Lilium, 10 of Iris, 8 of Tulip, 6 of Aquilegia, 10 of Thalictrum, 20 of Gentiana, 80 of ferns, 40 of Begonia, 50 of the Araceae. Seed germination tests, micropropagation, breeding for new varieties and other experiments and researches have been carried out on many of these plant groups.
Abstract
Plant introduction as a service to mankind is as old as mankind itself. It began when the most primitive form of agriculture took place - when man first learned that he could collect seed of his food plants from the wild and grow them near his home. Thus, he could be assured of a food supply, could grow it more abundantly, and above all, reduce his exposure to danger which was always present when he had to search for food in the wild.
One hundred U.S. sweetpotato [Ipomoea batatus (L.) Lam.] plant introductions (PIs) and four control cultivars were screened for insect injury in 1993. Of the least injured by insects, 56 and 31 were tested again in 1994 and 1995, respectively. Among control cultivars, the most highly resistant was `Regal' (moderately resistant), followed by `Beauregard' (susceptible), `Centennial' (susceptible), and `Jewel' (susceptible). Stem and root injury by the sweetpotato weevil (SPW) [Cylas formicarius elegantulus (Summers)] and root injury by the wireworm (Conoderus sp.)–Diabrotica sp. (cucumber beetle)– Systena sp. (flea beetle) (WDS) complex were measured. SPW stem injury was less severe (P ≤ 0.05) in 1994 and 1995 in PIs 508523, 531116, and 564107 than in control cultivars. PIs 508523 and 531116 also suffered less SPW root injury than did `Regal'. In the six PIs with least SPW root injury, PIs 538354, 564149, 508523, 538286, 531116, and 564103, 70% to 85% of the roots were not injured compared with 36% in `Regal' and 6% in `Jewel'. SPW root injury scores (0 = no injury; 5 = severe injury) in those PIs averaged 0.5 vs. 2.3 for `Regal'. Only in PI 538286 was WDS injury to roots less than in `Regal' over 2 years. However, eight additional accessions suffered less WDS injury than `Regal' in 1995 and four of those were among the six with least SPW injury. The lower levels of combined insect injury found in these four PIs (compared to `Regal') show that PIs have potential use for increasing insect resistance in sweetpotato improvement programs.