关键词: 烟草, 分泌型腺毛, 非分泌型腺毛, 镉胁迫

Abstract: As a specialized structure of plant epidermal cells, trichomes play an important role in plant-environment interaction. In present work, non-glandular tobacco variety T.I.1112 and glandular tobacco variety T.I.1068 were used to study the difference between glandular and non-glandular trichomes in response to cadmium (Cd) stress. By comparing the differential performance between T.I.1112 and T.I.1068 under Cd stress, it was found that T.I.1068 enhanced tolerance to Cd stress. The results of inductively coupled plasma optical emission spectrometry (ICP-OES) showed that the total Cd content in tobacco leaves gradually increased along with Cd treatment time, with the final Cd content in T.I.1112 and T.I.1068 showed no obvious difference, but the secreted Cd on leaf surface differed greatly, with much higher Cd content on leaf surface of glandular tobacco than non-glandular tobacco. These results indicated that glandular trichomes play more important role in improving tobacco tolerance to Cd by excluding toxic Cd outside the plant. Above results provided references for further work on tobacco breeding, cigarette safety improvement and soil remediation.

Key words: tobacco, glandular trichome, non-glandular trichome, cadmium stress