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. 2022 Aug 24;9:998946. doi: 10.3389/fnut.2022.998946

FIGURE 4.

FIGURE 4

Principal component analysis (PCA) of grain filling parameters, vascular bundle structures, grain C, N contents, and leaf enzyme activity. Gmean and Gmax, mean, and maximum grain filling rate; MTE, matter transport efficiency; MGC, MGN, and MGCN, grain C, N contents, and C/N ratio at maturity stage; RA0, RA30, and RA60, root activity in 0–15 cm, 15–30 cm, and 30–60 cm soil layer at milking stage, respectively; MDA0, MDA30, MDA60, and malondialdehyde contents in 0–15 cm, 15–30 cm, and 30–60 cm soil layer at milking stage, respectively; NSP and NSC, number of small vascular bundle in peduncle and cob; TAP and TAC, total phloem area of small vascular bundle in peduncle and cob; GFP, active filling phase; NPF, number of pollinated florets; SC, Sink capacity.