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Abstract Plant development requires communication on many levels, including between cells and between organelles within a cell. For example, mitochondria and plastids have been proposed to be sensors of environmental stress and to coordinate their responses. Here we present evidence for communication between mitochondria and chloroplasts during leaf and root development, based on genetic and physical interactions between three
M echanosensitive channel ofS mall conductance‐L ike (MSL ) proteins fromArabidopsis thaliana .MSL proteins areArabidopsis homologs of the bacterialM echanos ensitivec hannel ofS mall conductance (MscS), which relieves cellular osmotic pressure to protect against lysis during hypoosmotic shock.MSL 1 localizes to the inner mitochondrial membrane, whileMSL 2 andMSL 3 localize to the inner plastid membrane and are required to maintain plastid osmotic homeostasis during normal growth and development. In this study, we characterized the phenotypic effect of a genetic lesion in , both in wild type and inMSL 1msl2 msl3 mutant backgrounds.msl1 single mutants appear wild type for all phenotypes examined. The characteristic leaf rumpling inmsl2 msl3 double mutants was exacerbated in themsl1 msl2 msl3 triple mutant. However, the introduction of themsl1 lesion into themsl2 msl3 mutant background suppressed othermsl2 msl3 mutant phenotypes, including ectopic callus formation, accumulation of superoxide and hydrogen peroxide in the shoot apical meristem, decreased root length, and reduced number of lateral roots. All thesemore » -
Abstract Objectives The use of dental metrics in phylogenetic reconstructions of fossil primates assumes variation in tooth size is highly heritable. Quantitative genetic studies in humans and baboons have estimated high heritabilities for dental traits, providing a preliminary view of the variability of dental trait heritability in nonhuman primate species. To expand upon this view, the heritabilities and evolvabilities of linear dental dimensions are estimated in brown‐mantled tamarins (
) and rhesus macaques (Saguinus fuscicollis ).Macaca mulatta Materials and methods Quantitative genetic analyses were performed on linear dental dimensions collected from 302 brown‐mantled tamarins and 364 rhesus macaques. Heritabilities were estimated in SOLAR using pedigrees from each population, and evolvabilities were calculated manually.
Results Tamarin heritability estimates range from 0.19 to 0.99, and 25 of 26 tamarin estimates are significantly different from zero. Macaque heritability estimates range from 0.08 to 1.00, and 25 out of 28 estimates are significantly different from zero.
Discussion Dental dimensions are highly heritable in captive brown‐mantled tamarins and free‐ranging rhesus macaques. The range of heritability estimates in these populations is broadly similar to those of baboons and humans. Evolvability tends to increase with heritability, although evolvability is high relative to heritability in some dimensions. Estimating evolvability helps to contextualizemore »