THE WEEDINESS OF WILD PLANTS - MOLECULAR ANALYSIS OF GENES INFLUENCING DISPERSAL AND PERSISTENCE OF JOHNSONGRASS, SORGHUM-HALEPENSE (L) PERS

被引：188

作者：

PATERSON, AH ^{[1
]}

SCHERTZ, KF ^{[1
]}

LIN, YR ^{[1
]}

LIU, SC ^{[1
]}

CHANG, YL ^{[1
]}

机构：

[1] USDA,COLLEGE STN,TX 77843

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 1995年 / 92卷 / 13期

关键词：

POACEAE; RHIZOMES; GENOME MAPPING; BIOTECHNOLOGY RISK ASSESSMENT; PLANT GROWTH REGULATION;

D O I：

10.1073/pnas.92.13.6127

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Many major weeds rely upon vegetative dispersal by rhizomes and seed dispersal by ''shattering'' of the mature inflorescence. We report molecular analysis of these traits in a cross between cultivated and wild species of Sorghum that are the probable progenitors of the major weed ''johnsongrass.'' By restriction fragment length polymorphism mapping, variation in the number of rhizomes producing above-ground shoots was associated with three quantitative trait loci (QTLs). Variation in regrowth (ratooning) after overwintering was associated with QTLs accounting for additional rhizomatous growth and with QTLs influencing tillering. Vegetative buds that become rhizomes are similar to those that become tillers-one QTL appears to influence the number of such vegetative buds available, and additional independent genes determine whether individual buds differentiate into tillers or rhizomes. DNA markers described herein facilitate cloning of genes associated with weediness, comparative study of rhizomatousness in other Poaceae, and assessment of gene flow between cultivated and weedy sorghums-a risk that constrains improvement of sorghum through biotechnology. Cloning of ''weediness'' genes may create opportunities for plant growth regulation, in suppressing propagation of weeds and enhancing productivity of major forage, turf, and ''ratoon'' crops.

引用

页码：6127 / 6131

页数：5

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