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We tested the hypothesis that sharing essential resources through   interconnected ramets increases stress tolerance of a clonal plant in patchy   environments. A number of circle-shaped clones of Iris pumila naturally   growing in a sunexposed habitat were selected and cut into two equal halves   with different integration status: one with intact and the other with   disconnected rhizomes. One-half of each clone was then shaded with a neutral   screen to provide 50% of ambient irradiance, so that one-half of both clones   consisted of connected and disconnected halves (referred to as “clone   quarters”). Leaves collected from each clone quarter were analyzed for   malondialdehyde (MDA) content (a stress indicator) and the values of three   functional traits, specific leaf area (SLA), leaf dry matter content (LDMC)   and leaf water content (LWC). MDA content was greater in unshaded (more   stressed) than in shaded (less stressed) leaves. All three morphological   traits changed with light gradient, but only SLA was impacted by the ramet   integration status. SLA and MDA tended to be inversely related in each clone   quarter, indicating a (compensatory) mechanism utilized by I. pumila plants   in coping with environmental stress. SLA and LDMC were highly negatively   correlated in general, but less strongly in interconnected ramets compared to   those with a disrupted connection. The results suggest that intraclonal   physiological integration confers a fitness benefit to I. pumila plants in   heterogeneous environments, likely by balancing two fundamental plant   activities - rapid biomass production and nutrient conservation. [Projekat   Ministarstva nauke Republike Srbije, br. 173007

Does physiological integration among intraclonal ramets of Iris pumila enhance stress tolerance in heterogeneous environments?