ROOT HAIRS AND ROOT LENGTHS IN 9 WARM-SEASON TURFGRASS GENOTYPES

Root hairs contributed variously to total root length, ranging from a low of l% for 'Emerald' zoysia grass (Zoysia japonica Steud. X Z. tenuifolia Willd. ex Trin) and 5% for 'Georgia Common' centipedegrass [Eremochloa ophiuroides (Munro.) Hack], to a high of 95% and 89% for 'Texturf 10' and 'FB 119' bermudagrasses [Cynodon dactylon (L.) Pers.], respectively. Genotypes ranking highest for root lengths with root hairs also ranked highest for root lengths without root hairs and for number of main roots per plant. In terms of root lengths with root hairs, first-order lateral roots contributed more to total root length than root lengths of either main roots or second-order lateral roots for all nine genotypes. Number and length of root hairs arising from either main or lateral roots were not significantly affected by their relative distance from the cap of the main root. 'Texturf 10' and 'FB 119' bermudagrasses ranked highest for root and root-hair extent.