<mods:mods version="3.3" xsi:schemaLocation="http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-3.xsd" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><mods:titleInfo><mods:title>An Approach to Screening for Resistance to Water and Heat Stress in Sorghum (Sorghum bicolor (L.) Moench)</mods:title></mods:titleInfo><mods:name type="personal"><mods:namePart type="given">J M</mods:namePart><mods:namePart type="family">Peacock</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">S N</mods:namePart><mods:namePart type="family">Azam-Ali</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">R B</mods:namePart><mods:namePart type="family">Matthews</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:abstract>Sorghum (Sorglttrm bicolor (L.) hlocnchl is an important food crop of thc arid and scmiarrd tropics&#13;
but average yields are s t i l l bclow 1.000 kilograms per hcctare. and under drought conditions these&#13;
may fall below 100 kilogranls per hectare or there may evcn be total crop failure.&#13;
Breeding for drought ,resistance in sorghum is a complex problem. Th e ohjec~ivco f thi s paper&#13;
is to drscribc the developnicnt of a screening technique. based on a "physiological approach." Itiitially.&#13;
a sample of gcnotypes ucrc selected from the sorghum genetic rcsources acccs5ions at the&#13;
lntcrnational Crops Research I nsti tute for the Semi - Arid Tropics (ICKISAT) Ccntcr 10 rr'prc=,cnt&#13;
material collected from many countries over a range of altitudes (0 to 2.000 rnetcrs) and nwan annual&#13;
rainfall (250 to 2 .SO0 niillimcters). covering most of the taxonomic groups. Some advanced hrccding&#13;
materials were also included in this sample of over 700 lines. They were scrccncd undcr suvcre&#13;
drought conditions at ICRISAT in thc relatively rain-free summers from 1983 to 19S5.&#13;
Considerable genetic variation was shown in the response of these genotypes to ~.atcarn d&#13;
heat stress. Visually observcd dillercnces in "resistant" and "susceptible" genotypes in tcrnis of&#13;
desiccation tolerance or avoidance. recovery resistance and ability to produce grain after the onwt&#13;
of rains was thcn shown to be associatcd with spccilic physiological traits. Sc'lcctcd physiological&#13;
data from a fc\v contrasting genotypes wcrc shown on relati\'e leaf-watcr content (RL\VC). leafwater&#13;
potential and lcaf stoniatal conductance (gl). Thcse results vcrify that the visual "resi~-&#13;
tance" traits identificd earlier were bascd on measurable physiological responses.&#13;
In conclusion. i t is argued that thc approach described has proved to be succcsslul in idcntifying&#13;
drought-mistant germplasni. With more basic research on the same contrasting genotyps. the&#13;
problcm of idcntifying drought-rc%istant sorghums could be largely ovcrcome.</mods:abstract><mods:classification authority="lcc">Sorghum</mods:classification><mods:originInfo><mods:dateIssued encoding="iso8061">1985</mods:dateIssued></mods:originInfo><mods:genre>Conference or Workshop Item</mods:genre></mods:mods>