However, surprisingly few studies have attempted to survey the sexual reproductive capacity of vegetatively propagated crops in agricultural systems (Elias et al. 2017 Migicovsky & Myles 2017 Munguía‐Rosas & Jácome‐Flores 2020). Importantly, sexual reproductive capacity does not have to be completely lost – reduced fertility, viability, altered floral allometry or germination behaviour, as a result of deleterious mutations and genetic drift in reproductive traits, could still significantly hinder programmes that seek to recombine or conserve diversity as seeds (McClure et al. A tendency to lose sexual reproductive capacity, if widespread across domesticated vegetative crops, could significantly hinder future crop breeding programmes and integration of useful alleles from crop wild relatives (Dempewolf et al. For example, domestication of pineapple ( Ananas), which involved both sexual and asexual selection, resulted in reduced seed production through lower fertility and self‐incompatibility (Chen et al. 2020), but one commonality is the hypothesis that prolonged vegetative reproduction can lead to the loss or attenuation of sexual reproductive capacity (Eckert 2002 McKey et al. ![]() This diversity has hindered attempts to define a domestication syndrome (McKey et al. 2020).Ĭlonally propagated food crops encompass at least 34 families and a wide variety of morphological diversity (McKey et al. Improving our understanding of sexual reproduction in vegetatively propagated perennial crops, for example, through sexually reproducing wild progenitors (Miller & Gross 2011), has potential to address these challenges by enabling a broader range of useful plants to be banked as seed and used in breeding programmes, enhancing conservation and use of genetic diversity (McKey et al. Maintaining such collections is often logistically challenging and prohibitively expensive, particularly for developing countries (Dulloo et al. 2020), where ex situ or in vitro germplasm collections are currently the only viable approach for conserving genetic resources (Thormann & Dulloo 2006). Vegetatively propagated crops are especially important in the tropics (Denham et al. However, an emphasis on conventional seed crops may overlook the majority of perennial fruit crops, for which vegetative propagation is the predominant means of replication and where seed generation may be rare or absent (Miller & Gross 2011 Castañeda‐Álvarez et al. To address this challenge, a significant effort has been made to conserve >2 million unique accessions, representing >16,500 plant species in 1750 gene banks worldwide (Commission for Genetic Resources on Food & Agriculture 2010 Fu 2017). ![]() 11.5"L X 10.5"W X 12"H.The erosion of plant genetic resources poses a substantial threat to food security and the diverse benefits we derive from useful plants (Powell et al. Semi-automatic loading means there is not need to level samples.Īctual dims 10"L x 8"W X 11"H, Ship dims. ![]() Simply choose your grain, load the hopper, and press a button. The GAC500XT delivers the fastest, most convenient on-farm moisture testing you'll find. It is also preloaded with 10 different languages. The unit is available with a choice of power sources: 110/220V, DC converter, or cigarette lighter. The unit stores up to 16 calibrations and you can simply download the files from the Dickey-John web site and choose from more than 450 grain and product calibrations listed there. The GAC500XT gives accurate, consistent results with the push of a button and provides + or - 0.2 moisture repeatability (depending upon application) on crops such as cereals, oilseeds, grass seeds, vegetable seeds, and beans. Dickey-John Manual Moisture Tester GAC500XTĪnalyze your grain for moisture, temperature, and test weight in the field, at the bin, or anywhere with this compact, and cost-effective unit.
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