Agronomic Performance and Multiple Disease Resistance in T2BS.2RL Wheat‐Rye Translocation Lines

Abstract

Wheat (Triticum aestivum L.)‐Rye (Secale cereale L.) T2BS.2RL translocations were shown to increase grain yield, resistance to biotic and abiotic stresses, and had minor effects on baking quality. The objective of this study was to test agronomic performance and resistance of a new wheat‐rye translocation (T2BS.2RL, SLU) to powdery mildew (Blumeria graminis f. sp. tritici (DC.) E. O. Speer), leaf rust (Puccinia triticina Eriks.), stem rust (Puccinia graminis f. sp. tritici Eriks. & Henn.), stripe rust (Puccinia striiformis f. sp. tritici Westend.) and Hessian fly [Mayetiola destructor (Say)]. F2 derived F4–F6 T2BS.2RL lines, non‐translocation lines, and the wheat cultivar Holme were compared using intact seedlings or leaf segments. T2BS.2RL conferred seedling resistance to 17 powdery mildew isolates, 14 leaf rust and one stem rust pathotype. The T2BS.2RL lines were susceptible to 3 stripe rust pathotypes as seedlings, while showing adult plant resistance under natural conditions. Agronomic characters were compared in a 2‐yr hill‐plot field trial in Sweden. T2BS.2RL lines flowered 2 to 3 d later and had an increased number of spikelets per spike. The T2BS.2RL had no significant effect on yield, straw length, lodging, volume weight, 1000‐kernel weight, fertility, α‐amylase activity, or starch or protein content. The multiple disease resistance and the minor negative effects on agronomic performance of the T2BS.2RL, SLU translocation encourage its use in wheat breeding.

INLUENCE OF ALIEN GENETIC MATERIAL ON THE MANIFESTATION OF AGRONOMICALLY IMPORTANT TRAITS OF COMMON WHEAT (T. aestivum L.)

“…В то же время присутствие транслокации T2BS.2RL в геноме селекционных линий пшеницы повышает засухоустойчи вость, увеличивает число колосков в колосе, не снижая при этом урожайность и содержание белка в зерне (Merker, Forsstrom, 2000;Hysing et al, 2007).…”

Translocações cromossômicas entre trigo e centeio: uma alternativa ao melhoramento

“…EHDAIE et al (2003) abordaram, inclusive, que a presença da translocação 2BS.2RL diminuia o tempo de maturação e aumentava o número de grãos por espiga, bem como, que a presença da translocação proveniente da linhagem 'Hamlet' no trigo cultivar 'Karl' acrescia o rendimento de grãos, biomassa aérea na maturidade, grãos por espiga, grãos por planta, mas diminuia o período de maturação e o peso do grão. HYSING et al (2007) complementaram afirmando que esta translocação tinha efeito positivo no rendimento e pouca influência na qualidade de panificação, podendo ser utilizada para transferência de genes de resistência a doenças.…”

“…Já a translocação 2AS.2RL, proveniente da cultivar 'Imperial', presente na cultivar 'Chinese Spring', apresentou melhor rendimento de grãos, biossama até a maturação, biomassa da raiz e eficiência no uso da água (KNACKSTEDT et al, 1994;EHDAIE et al, 2003). HYSING et al (2007) também avaliaram cultivares provenientes de linhas de substituição ('Holme/Kraka//Holme') de 1B e 2B por, respectivamente, 1R e 2R. Todas as linhagens foram resistentes a 17 raças isoladas de oídio na germinação e a mistura de raças na fase de planta adulta.…”

New resistance sources to Russian wheat aphid (Diuraphis noxia) in Swedish wheat substitution and translocation lines with rye (Secale cereale) and Leymus mollis

“…A part of the examined material has also previously been investigated for different diseases (Forsström 2002;Hysing et al 2006Hysing et al , 2007, as well as for root characteristics and competition abilities (Bertholdsson et al 2012). Thus, the present material is of relevance also for studies of various diseases/ pests and performance in other important characters doi: 10.17221/72/2015-CJGPB to obtain wheat lines usable in breeding for resistance to a large range of diseases and pests.…”