Genetic control of germination in Orobanche

Genetic control of germination in Orobanche

Genetic con­trol of ger­min­a­tion in Orobanche

The tiny seeds of the oblig­ate root para­sitic plants of the Orobanchaceae do not ger­min­ate unless they detect chem­ical sig­nals from a suit­able host plant. After cross­ing the two closely related spe­cies Orobanche cernua and O. cumana, Plakhine et al. find hybrid fam­il­ies that do not need chem­ical stim­u­la­tion for ger­min­a­tion. This lethal trait appears only in F3 and fur­ther gen­er­a­tions, indic­at­ing that the depend­ence on external chem­ical stim­uli is genet­ic­ally con­trolled in the seed peri­sperm, which is the only seed tis­sue of mater­nal ori­gin. The res­ults sug­gest that the stim­u­lant recept­ors are loc­ated in the cells of the peri­sperm that are loc­ated beneath the micropyle.

Annals of Botany Office.

The Annals of Botany Office is based at the University of Leicester.

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