69 several cases, for example A. auriculiformis in Thailand (LUANGVIRIYASAENG and PINYOPUSARERK, 1998). Build-up of inbreeding through self-fertilization occurring in isolated trees or poorly-flowering stands used for seed collection over successive generations, and the associated depression of vigour that we have demonstrated in this study, could explain this phenomenon. 185-195 (1996)
Acknowledgments
AbstractThis screening study analyzed ploidy levels by counting the chromosome number of 61 Aigeiros cultivars grown in China. Triploid Aigeiros has been found in four of these cultivars: Populus x euramericana (Dode) Guiner cv. Wuhei-1, P. x Liaohenica, P. Langfangensis-3 Wang (P. deltodide Barry cv. "Shanhaiguan" x P. simonii x P. pyramidalis-12 + Ulmus pumila Linn.), and P. x euramericana (Dode) Guinier. cv. "Zhonglin-46". The karyotype analysis indicates that triploid Aigeiros might be derived from original allotriploid. Because growth of the triploid trees was faster than their respective diploid hybrids or clones in the plantations where we collected the materials, we expect that they will play a significant role in breeding, reforestation and fiber production in China.
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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Facile Synthesis of Phenyl((1-benzyloxycarbonylamino)(aryl)methyl) phosphinopeptide Derivatives.-A convenient approach to αaminophosphinic acid derivatives (cf. (VIII)) and phosphinopeptide derivatives (cf. (VI)) via phosphinic chloride (IV) is described. -(DAI, Q.; CHEN, R.; Synth.
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