Peculiarities of the formation of the caudiciform part of Petopentia natalensis (Schltr.) Bullock (Apocynaceae) Author Aviekin, Yaroslav Kyiv Taras Shevchenko National University, Educational and Scientific Centre « Institute of Biology and Medicine », str. Symona Petlyury, 1, 01032 Kyiv (Ukraine) avekinyarik@gmail.com nuzhynan@gmail.com Author Nuzhyna, Nataliia Kyiv Taras Shevchenko National University, Educational and Scientific Centre « Institute of Biology and Medicine », str. Symona Petlyury, 1, 01032 Kyiv (Ukraine) nuzhynan@gmail.com Author Gaidarzhy, Maryna Kyiv Taras Shevchenko National University, Educational and Scientific Centre « Institute of Biology and Medicine », str. Symona Petlyury, 1, 01032 Kyiv (Ukraine) gaidarzhy@ukr.net text Adansonia 2021 3 2021-02-08 43 3 19 30 journal article 10.5252/adansonia2021v43a3 1639-4798 4519145

TABLE 2. — Morphometric indices of cells in plants of Petopentia natalensis (Schltr.) Bullock at different stages of ontogenesis (M±SD). Abbreviation and symbol: BPS, basal part of the stem in juvenile and immature plants; *, P ≤ 0.05, comparative to the previous stage of ontogenesis.

Organs	Tissues		Parameters (μm)	Seedlings	Juvenile plants	Immature plants
Upper part Epidermis			width	–	21.2±1.5	–
of the stem	Periderm	Phellem Phelloderm	width width	– –	49.2±4.7 32.8±3.7	52.3±5.1* 33.5 ± 4.6
	Cortical parenchyma width		27.3±3.9	34.4±4.7*	–	–
	Pith		diameter	–	50.8±12.4	102.3±53.7*
Hypocotyl	Epidermis		width	19.5±1.7	24.6±2.4	–
/ BPS	Periderm	Phellem	width	–	55.8±4.2	61.2±5.7*
		Phelloderm	width	–	46.1±4.6	52.1±5.1*
	Cortical parenchyma width	78.6±14.7	82.1±23.2	112.3±29.5*	–	–
	Pith		diameter	98.5±31.7	131 ±49.6	145.6±52.9
Main root	Epiblema Exoderm		width width	8.3±1.1 48.2±5.2	6.7±2.3 54.5±6.2*	– –
	Periderm	Phellem Phelloderm	width width	– –	– –	59.1±8.4 29.5±5.3
	Cortical parenchyma		diameter	38.8±5.1	45.8±6.7*	81.5±19.4*