A considerable part of the area is cultivated and is dominated by maize-sorghum and maize-sorghum-perennial complex.
Watson's answer to this hardy perennial is complex and multifaceted.
Orchards are complex perennial agroecosystems formed of grass and tree layers aiming at the production of fresh fruit that require specific design and management over space and time.
Given that map-based cloning of candidate genes is extremely time and resource intensive, even for model species with abundant resources, the possibility of using association mapping as a tool for cloning genes of functional relevance has the potential to accelerate genetic improvement of the complex perennial Populus.
After the flowering of oilseed rape (OSR), simplified landscapes contained substantially less herbaceous flower resources and a lower proportion of perennials, compared to complex ones.
But many development specialists worry that Mr Wolfowitz's approach is both naive and arbitrary.Corruption, they argue, is a complex and perennial problem.
Most members of the species complex are perennial diploid outbreeders (2 n = 2 x = 16), but also tetraploid cytotypes occur [ 7, 6, 8].
Despite the significant progress achieved so far, genetic improvement of mulberry yield potential through conventional breeding has been distressingly slow, mainly because of the perennial growth habit and complex inheritance pattern.
The increased number of SET genes with potentially distinct functions could have supported the evolution of epigenetic gene regulation of a woody perennial that is more complex than that of an herbaceous annual.
This developmental transition in perennials is probably more complex than in other plants and the molecular mechanisms are less well understood.
The method is exemplified with the calibration of a projection matrix in an age-stage-structured model (published elsewhere) for Calamagrostis canescens, a perennial herbaceous species with a complex (multivariant) life cycle that features unlimited growth when colonizing open areas.
