2.2. Plant materials, growth conditions and treatments
Commercially available seeds of tomato (Solanum lycopersicum L. cv Jiangshu 14) were surface-sterilized and rinsed extensively in distilled water. After soaking overnight, seeds were germinated on filter papers imbibed in distilled water at 25 ± 1 °C in the darkness. 2-d-old seedlings were then transferred to an illuminating incubator and maintained at 25 ± 1 °C with a 14-h photoperiod at 200 μmol m−2 s−1 intensity.
After growing for another day, the selected identical seedlings with radicals 2–3 mm were incubated with 4 ml of the various solutions as indicated for the indicated time points. Afterward, the photographs were taken. The number of lateral root (LR) and the length of all LRs (>1 mm) per seedling, as well as LR density (the number of LR per cm primary root; LRs·cm−1) were quantified with Image J software. LR primordia (LRP) per seedling were observed after 1 d of treatments by root squash preparations and quantified by a light microscope (model Stemi 2000-C; Carl Zeiss, Germany). According to the previous method (Correa-Aragunde et al., 2006), the root apical meristems of tomato seedlings at the indicated time points were cut off and the shoots were removed by cutting below the root-shoot junction in order to obtain samples of only lateral root-inducible segments for the corresponding biochemical and molecular determination.
2.2. Plant materials, growth conditions and treatments
Commercially available seeds of tomato (Solanum lycopersicum L. cv Jiangshu 14) were surface-sterilized and rinsed extensively in distilled water. After soaking overnight, seeds were germinated on filter papers imbibed in distilled water at 25 ± 1 °C in the darkness. 2-d-old seedlings were then transferred to an illuminating incubator and maintained at 25 ± 1 °C with a 14-h photoperiod at 200 μmol m−2 s−1 intensity.
After growing for another day, the selected identical seedlings with radicals 2–3 mm were incubated with 4 ml of the various solutions as indicated for the indicated time points. Afterward, the photographs were taken. The number of lateral root (LR) and the length of all LRs (>1 mm) per seedling, as well as LR density (the number of LR per cm primary root; LRs·cm−1) were quantified with Image J software. LR primordia (LRP) per seedling were observed after 1 d of treatments by root squash preparations and quantified by a light microscope (model Stemi 2000-C; Carl Zeiss, Germany). According to the previous method (Correa-Aragunde et al., 2006), the root apical meristems of tomato seedlings at the indicated time points were cut off and the shoots were removed by cutting below the root-shoot junction in order to obtain samples of only lateral root-inducible segments for the corresponding biochemical and molecular determination.
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