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O trabalho estudou o controle genético dos caracteres comprimento (CRP) e número de nós (NNRP) do ramo principal e hábito de crescimento em feijão-caupi, a partir dos cruzamentos TE96-282-22G x TVX-5058-09C e TE96-282-22G x IT81D-1332. O experimento foi conduzido na Embrapa Meio-Norte, em Teresina, PI, Brasil, no ano de 2003.

Phaseolus lunatus L. known as lima bean, is a tropical legume specie known for high genetic diversity and yield potential (MAQUET et al., 1999). The analysis of genetic diversity is needed for better conservation. Estimating genetic diversity, by multivariate analysis, enhances the efficiency of germplasm collection management and genetic improvement. This study was conducted to investigate the genetic diversity in Lima Bean Active Germplasm Bank (BAG) from Federal University of Piauí (UFPI) based on quantitative traits of seeds.

Lima bean (Phaseolus lunatus L.) is one of four species of the genus Phaseolus commercially exploited, with the potential to provide vegetable protein. In Brazil, mainly in the Northeast region, is a income and alternative food source for the population. Boca de moça landrace is among the most widely consumed in the Piauí State, due to color pattern characteristic of their seeds. This study aimed to characterize lima bean populations of the Boca de moça landrace, based on agronomic traits, to verify the genetic diversity and to select individual plants with potential for improvement.

The castanheira-do-gurguéia is a native fruit tree with great regional importance, whose almond present pleasant flavor and exploration still limited. The objective of this research was to evaluate the physical and chemical-nutritional characteristics of 23 castanheira-do-gurguéia genotypes from natural occurrence areas of Piauí State southwestern savannah. A sample of 30 to 50 fruits per genotype was collected. The physical characteristics analyzed were: fruit mass, pericarp mass, fruit length, larger fruit thickness, fruit length/larger fruit thickness ratio, smaller fruit thickness, fruit length/smaller fruit thickness ratio, larger pericarp thickness, smaller pericarp thickness, longitudinal diameter of the pericarp cavity, vertical diameter of the pericarp cavity, almond mass, almond length, larger almond thickness, smaller almond thickness and almond length/larger almond thickness ratio. The following chemical-nutritional characteristics of almonds were analyzed: fat, crude protein, crude fiber, ash total carbohydrates, crude energy and minerals (P, K, Ca, Mg, Mn, Fe, Cu and Zn). The data were submitted to analysis of variance and genotypes means were compared by Scott-Knott?s test at 5%. There were differences among genotypes for all physical and chemical-nutritional characteristics evaluated, except Ca in the almonds. It was verified the presence of great phenotypic variability in the analyzed germplasm. The genotype G-3 is the most promising in terms of almond mass, almond length and larger almond thickness, and the genotypes G-7, G-10, G-13 and G-23 are the most promising in the chemical-nutritional composition.

One of the main crops and income and alternative food source for the population from Northeast region of Brazil is the lima bean (Phaseolus lunatus), besides an important source of protein for the rural population from South America and Africa. It is consumed either as fresh or dried beans. The characterization of Phaseolus lunatus germplasm has a significant impact on the impovment of crop plants and could help to improve the knowledge about genetic variability and differentiation patterns. Thus, this work aimed to evaluate genetic diversity among 24 lima bean samples using quantitative and qualitative descriptors by multivariate procedures.

O objetivo deste trabalho foi avaliar a adaptabilidade e a estabilidade da produtividade de grãos de 16 genótipos de feijão caupi (Vigna unguiculata (L.) Walp.) utilizando o modelo de efeitos aditivos principais e interação multiplicativa. Os ensaios foram realizados em nove ambientes, locais e anos, da região Meio-Norte do Brasil, Estados do Piauí (PI) e Maranhão (MA), no período de 1999 a 2001. Os efeitos de ambientes e interação genótipos x ambientes, e os dois primeiros eixos da análise de componentes principais da interação foram significativos (P