Visually categorized; based on typical appearance; scale reflects gradient length - 0 (no intensity gradient at the trichome stem; 0.5; 1; 1.5; 2; 2.5; 3 (longest); from bright field photographs of 3 dithizone-staines leaves of 3 plants. Abbreviated as metal gradient in the article.
Arabidopsis seeds were sterilized with chlorine gas; stratified in tubes at 4 deg. C for three days in the dark and sown into standard soil substrate pre-treated with Confidor to prevent black flies infestation. Plants were grown under controlled long-day conditions (16 hr light; 23 oC/8 hr darkness; 18 oC; relative air humidity 60 %). Three seedlings per genotype were planted into individual pots at the first true leaf stage. Three approximately fingernail-sized mature; non-senescent rosette leaves per plant were collected at the age of 5 weeks (at which point plants of some but not all of the genotypes were beginning to bolt).
May 17, 2023, 1:48 p.m.
* The Shapiro-Wilk test tests the null hypothesis that the data was drawn from a normal distribution.