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Bu araştırma; Sakarya/Pamukova ekoloji k koşullarında kurulmuş ve bazı yemli k pancar çeşi tleri ni n veri m ve kali te özelli kleri ni n beli rlenmesi amacıyla 15 Ni san 2014 -5 Ni san 2016 tari hleri arasında 2 yıl süreyle yürütülmüştür. Deneme, tesadüf blokları deneme deseni nde dört tekrarlamalı olarak kurulmuştur. Tohumluk materyali olarak; Rekord, Rota, Ursus ve Zentaur çeşi tleri kullanılmıştır. Araştırmada; yumruda; boy (cm), toprak üstü boy oranı (%), çap (cm), veri m (kg/da), kuru madde oranı (%), protei n oranı (%), şeker oranı (%) ve depoda yaş ağırlık kaybı (%) i le yaprakta; yaş veri m (kg/da), kuru madde oranı (%), kuru madde veri mi (kg/da) ve protei n oranı (%) özelli kleri i ncelenmi şti r. Araştırmada en olumlu veri ler Ursus çeşi di nden elde edi lmi şti r.Anahtar kelimeler: Yemli k pancar, yumru veri mi , yaprak veri mi , protei n oranı, şeker oranı.

Sunflower (Helianthus annuus L.) suffers from terminal drought accompanying with high temperature stress since it grows mainly in rain fed areas. Therefore, plant breeders try to improve more drought tolerant varieties and to screen their genetic materials for drought resistance. The present study was conducted to determine drought tolerance levels of sunflower male inbred lines developed by Trakya Agricultural Research Institute (TARI), Edirne, Turkey. Inbred lines grown under controlled environmental conditions were sorted by polyphasic chlorophyll a fluorescence measurements. Drought stress applications were performed at three sunflower growth stages as R-3 (vegetative), R5-1 (head formation) and R-6 (milky seed). Based on applied different JIP-Test (analysis of O-J-I-P fluorescence transient) parameters such as Drought Factor index (-DFI)and Damage index (-DI), 70352 R, 8129 R, 0536 R and 9947 R restorer lines were found more drought tolerant than those of the other examined sunflower inbred lines, whereas TT 317 R and TT 199 R were determined as more drought sensitive than others. The drought tolerant inbred lines will be helpful to improve drought resistance in sunflower breeding programs.

Broomrape (Orobanche cernua Loeffl.) is the most serious problem in sunflower production in Turkey, some East European countries and Spain. A research covering broomrape tests of sunflower hybrids in the trials based on National Sunflower Research Project was conducted in Trakya region, which holds 75% of the sunflower production in Turkey, in 2006, 2007 and 2008. Based on this project, in conditions of natural infestation, 306, 443 and 533 commercial and candidate hybrids, inbred lines, etc. were tested in 2006, 2007 and 2008, respectively. Of the tested materials, 12 in 2006, 56 in 2007 and 140 in 2008 were found to be resistant. During winter, broomrape tests continued in growth chambers and in pots, under conditions of artificial infestation. Broomrape seeds were collected from a naturally infested area in Trakya region and used to determine the reaction of developed hybrids and lines to the collected races. In this part of the study, 1752, 816 and 1389 genetic material were tested in 2006, 2007 and 2008, respectively. The tests showed that 332, 94, and 404 materials in 2006, 2007 and 2008, respectively, were resistant to the new races of broomrape used in the study.

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